iconv: fix "make make-ref"

[trasz]

Summary

The purpose of this command is to "refresh" the source reference
files generated with GNU libiconv. Previously it would regenerate
copies somewhere in OBJDIR, which we don't use.

tools/test/iconv/Makefile

else if (error == 0 && p_providers == NULL) {
                                 /* How do we report errors here? */
                                 return;
                 } else if (error == -1 && errno == ENOMEM) {
                         /*
                          * The current buffer isn't large enough, so
                          * reallocate it. We normally won't need to do this
                          * because providers aren't being loaded all the time.
                          */
-                        if ((p = realloc(p_providers,len)) == NULL)
+                        if ((p = realloc(p_providers,len)) == NULL) {
+                                free(p_providers);
                                 /* How do we report errors here? */
                                 return;
+                        }
                         p_providers = p;
                 } else
                         break;
         }
 
         /* Check if we got a string of provider names: */
         if (error == 0 && len > 0 && p_providers != NULL) {
                 p = p_providers;
if (dtfd == -1) {
                 }
                 return (set_open_errno(dtp, errp, err));
         }
 
         (void) fcntl(dtfd, F_SETFD, FD_CLOEXEC);
         (void) fcntl(ftfd, F_SETFD, FD_CLOEXEC);
 
 alloc:
-        if ((dtp = malloc(sizeof (dtrace_hdl_t))) == NULL)
+        if ((dtp = malloc(sizeof (dtrace_hdl_t))) == NULL) {
+                dt_provmod_destroy(&provmod);
                 return (set_open_errno(dtp, errp, EDT_NOMEM));
+        }
 
         bzero(dtp, sizeof (dtrace_hdl_t));
         dtp->dt_oflags = flags;
 #ifdef illumos
         dtp->dt_prcmode = DT_PROC_STOP_PREINIT;
 #else
         dtp->dt_prcmode = DT_PROC_STOP_POSTINIT;
 #endif