Index: sys/arm64/arm64/vm_machdep.c
===================================================================
--- sys/arm64/arm64/vm_machdep.c
+++ sys/arm64/arm64/vm_machdep.c
@@ -140,12 +140,14 @@
 
 	frame = td->td_frame;
 
-	switch (error) {
-	case 0:
+	if (__predict_true(error == 0)) {
 		frame->tf_x[0] = td->td_retval[0];
 		frame->tf_x[1] = td->td_retval[1];
 		frame->tf_spsr &= ~PSR_C;	/* carry bit */
-		break;
+		return;
+	}
+
+	switch (error) {
 	case ERESTART:
 		frame->tf_elr -= 4;
 		break;