diff --git a/sys/dev/sound/fdt/audio_soc.c b/sys/dev/sound/fdt/audio_soc.c
--- a/sys/dev/sound/fdt/audio_soc.c
+++ b/sys/dev/sound/fdt/audio_soc.c
@@ -367,7 +367,7 @@
 		auxdev = OF_device_from_xref(aux_devs[i]);
 		if (auxdev == NULL)
 			device_printf(sc->dev, "warning: no driver attached to aux node\n");
-		aux_node = (struct audio_soc_aux_node *)malloc(sizeof(*aux_node), M_DEVBUF, M_NOWAIT);
+		aux_node = malloc(sizeof(*aux_node), M_DEVBUF, M_NOWAIT);
 		if (aux_node == NULL) {
 			device_printf(sc->dev, "failed to allocate aux node struct\n");
 			return;
diff --git a/sys/dev/sound/pci/hda/hdaa.c b/sys/dev/sound/pci/hda/hdaa.c
--- a/sys/dev/sound/pci/hda/hdaa.c
+++ b/sys/dev/sound/pci/hda/hdaa.c
@@ -3033,8 +3033,7 @@
 	if (max < 1)
 		return;
 
-	ctls = (struct hdaa_audio_ctl *)malloc(
-	    sizeof(*ctls) * max, M_HDAA, M_ZERO | M_NOWAIT);
+	ctls = malloc(sizeof(*ctls) * max, M_HDAA, M_ZERO | M_NOWAIT);
 
 	if (ctls == NULL) {
 		/* Blekh! */
@@ -3186,8 +3185,7 @@
 	if (max < 1)
 		return;
 
-	as = (struct hdaa_audio_as *)malloc(
-	    sizeof(*as) * max, M_HDAA, M_ZERO | M_NOWAIT);
+	as = malloc(sizeof(*as) * max, M_HDAA, M_ZERO | M_NOWAIT);
 
 	if (as == NULL) {
 		/* Blekh! */
@@ -4077,8 +4075,7 @@
 			cnt += as[j].num_chans;
 	}
 	if (devinfo->num_chans == 0) {
-		devinfo->chans = (struct hdaa_chan *)malloc(
-		    sizeof(struct hdaa_chan) * cnt,
+		devinfo->chans = malloc(sizeof(struct hdaa_chan) * cnt,
 		    M_HDAA, M_ZERO | M_NOWAIT);
 		if (devinfo->chans == NULL) {
 			device_printf(devinfo->dev,
@@ -5490,10 +5487,8 @@
 	}
 	devinfo->num_devs =
 	    max(ardev, apdev) + max(drdev, dpdev);
-	devinfo->devs =
-	    (struct hdaa_pcm_devinfo *)malloc(
-	    devinfo->num_devs * sizeof(struct hdaa_pcm_devinfo),
-	    M_HDAA, M_ZERO | M_NOWAIT);
+	devinfo->devs = malloc(devinfo->num_devs *
+	    sizeof(struct hdaa_pcm_devinfo), M_HDAA, M_ZERO | M_NOWAIT);
 	if (devinfo->devs == NULL) {
 		device_printf(devinfo->dev,
 		    "Unable to allocate memory for devices\n");
@@ -6625,9 +6620,8 @@
 	);
 
 	if (devinfo->nodecnt > 0)
-		devinfo->widget = (struct hdaa_widget *)malloc(
-		    sizeof(*(devinfo->widget)) * devinfo->nodecnt, M_HDAA,
-		    M_WAITOK | M_ZERO);
+		devinfo->widget = malloc(sizeof(*(devinfo->widget)) *
+		    devinfo->nodecnt, M_HDAA, M_WAITOK | M_ZERO);
 	else
 		devinfo->widget = NULL;
 
diff --git a/sys/dev/sound/pci/maestro3.c b/sys/dev/sound/pci/maestro3.c
--- a/sys/dev/sound/pci/maestro3.c
+++ b/sys/dev/sound/pci/maestro3.c
@@ -1453,7 +1453,7 @@
 	/* Create the buffer for saving the card state during suspend */
 	len = sizeof(u_int16_t) * (REV_B_CODE_MEMORY_LENGTH +
 	    REV_B_DATA_MEMORY_LENGTH);
-	sc->savemem = (u_int16_t*)malloc(len, M_DEVBUF, M_WAITOK | M_ZERO);
+	sc->savemem = malloc(len, M_DEVBUF, M_WAITOK | M_ZERO);
 
 	return 0;
 
diff --git a/sys/dev/sound/pci/spicds.c b/sys/dev/sound/pci/spicds.c
--- a/sys/dev/sound/pci/spicds.c
+++ b/sys/dev/sound/pci/spicds.c
@@ -144,7 +144,7 @@
 #if(0)
 	device_printf(dev, "spicds_create(dev, devinfo, %d, ctrl)\n", num);
 #endif
-	codec = (struct spicds_info *)malloc(sizeof *codec, M_SPICDS, M_NOWAIT);
+	codec = malloc(sizeof(*codec), M_SPICDS, M_NOWAIT);
 	if (codec == NULL)
 		return NULL;
 
diff --git a/sys/dev/sound/pcm/dsp.c b/sys/dev/sound/pcm/dsp.c
--- a/sys/dev/sound/pcm/dsp.c
+++ b/sys/dev/sound/pcm/dsp.c
@@ -2493,7 +2493,7 @@
 	 * syncgroup.
 	 */
 	if (group->id == 0) {
-		sg = (struct pcmchan_syncgroup *)malloc(sizeof(*sg), M_DEVBUF, M_NOWAIT);
+		sg = malloc(sizeof(*sg), M_DEVBUF, M_NOWAIT);
 		if (sg != NULL) {
 			SLIST_INIT(&sg->members);
 			sg->id = alloc_unr(pcmsg_unrhdr);
@@ -2520,7 +2520,7 @@
 	 * insert into syncgroup.
 	 */
 	if (group->mode & PCM_ENABLE_INPUT) {
-		smrd = (struct pcmchan_syncmember *)malloc(sizeof(*smrd), M_DEVBUF, M_NOWAIT);
+		smrd = malloc(sizeof(*smrd), M_DEVBUF, M_NOWAIT);
 		if (smrd == NULL) {
 			ret = ENOMEM;
 			goto out;
@@ -2536,7 +2536,7 @@
 	}
 
 	if (group->mode & PCM_ENABLE_OUTPUT) {
-		smwr = (struct pcmchan_syncmember *)malloc(sizeof(*smwr), M_DEVBUF, M_NOWAIT);
+		smwr = malloc(sizeof(*smwr), M_DEVBUF, M_NOWAIT);
 		if (smwr == NULL) {
 			ret = ENOMEM;
 			goto out;
diff --git a/sys/dev/sound/pcm/sndstat.c b/sys/dev/sound/pcm/sndstat.c
--- a/sys/dev/sound/pcm/sndstat.c
+++ b/sys/dev/sound/pcm/sndstat.c
@@ -1109,7 +1109,7 @@
 	if (e == NULL)
 		goto fail;
 	ud->nameunit = strndup(line, e - line, M_DEVBUF);
-	ud->devnode = (char *)malloc(e - line + 1, M_DEVBUF, M_WAITOK | M_ZERO);
+	ud->devnode = malloc(e - line + 1, M_DEVBUF, M_WAITOK | M_ZERO);
 	strlcat(ud->devnode, ud->nameunit, e - line + 1);
 	line = e + 1;