6659 nvlist_free(NULL) is a no-op

@@ -705,17 +705,15 @@
                                     "for `%s'!\n", cstr);
                         }
                 } else if (diskp != NULL) {
                         diskmon_free(diskp);
                 } else {
-                        if (dmap_nvl)
                                 nvlist_free(dmap_nvl);
                         if (indp)
                                 ind_free(indp);
                         if (indrp)
                                 indrule_free(indrp);
-                        if (diskprops)
                                 nvlist_free(diskprops);
                 }
 
                 wdp->pfmri = cstr;
         }