Illumos 6659 - nvlist_free(NULL) is a no-op

6659 nvlist_free(NULL) is a no-op
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: Marcel Telka <marcel@telka.sk>
Approved by: Robert Mustacchi <rm@joyent.com>

References:
  https://www.illumos.org/issues/6659
  https://github.com/illumos/illumos-gate/commit/aab83bb

Ported-by: David Quigley <dpquigl@davequigley.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4566

cmd/zfs/zfs_main.c

@@ -5294,7 +5294,6 @@ zfs_do_allow_unallow_impl(int argc, char **argv, boolean_t un)
 
 cleanup0:
 	nvlist_free(perm_nvl);
-	if (update_perm_nvl != NULL)
 	nvlist_free(update_perm_nvl);
 cleanup1:
 	fs_perm_set_fini(&fs_perm_set);

cmd/zpool/zpool_main.c

@@ -3674,7 +3674,6 @@ zpool_do_split(int argc, char **argv)
 			if (add_prop_list(
 			    zpool_prop_to_name(ZPOOL_PROP_ALTROOT), optarg,
 			    &props, B_TRUE) != 0) {
-				if (props)
 				nvlist_free(props);
 				usage(B_FALSE);
 			}
@@ -3688,7 +3687,6 @@ zpool_do_split(int argc, char **argv)
 				propval++;
 				if (add_prop_list(optarg, propval,
 				    &props, B_TRUE) != 0) {
-					if (props)
 					nvlist_free(props);
 					usage(B_FALSE);
 				}

cmd/zpool/zpool_vdev.c

@@ -1675,7 +1675,6 @@ split_mirror_vdev(zpool_handle_t *zhp, char *newname, nvlist_t *props,
 	}
 
 	if (zpool_vdev_split(zhp, newname, &newroot, props, flags) != 0) {
-		if (newroot != NULL)
 		nvlist_free(newroot);
 		return (NULL);
 	}

lib/libzfs/libzfs_config.c

@@ -311,7 +311,6 @@ zpool_refresh_stats(zpool_handle_t *zhp, boolean_t *missing)
 	zhp->zpool_config_size = zc.zc_nvlist_dst_size;
 
 	if (zhp->zpool_config != NULL) {
-		if (zhp->zpool_old_config != NULL)
 		nvlist_free(zhp->zpool_old_config);
 
 		zhp->zpool_old_config = zhp->zpool_config;

lib/libzfs/libzfs_dataset.c

@@ -2079,7 +2079,6 @@ get_numeric_property(zfs_handle_t *zhp, zfs_prop_t prop, zprop_source_t *src,
 			zcmd_free_nvlists(&zc);
 			return (-1);
 		}
-		if (zplprops)
 		nvlist_free(zplprops);
 		zcmd_free_nvlists(&zc);
 		break;
@@ -4269,7 +4268,6 @@ zfs_smb_acl_mgmt(libzfs_handle_t *hdl, char *dataset, char *path,
 		return (-1);
 	}
 	error = ioctl(hdl->libzfs_fd, ZFS_IOC_SMB_ACL, &zc);
-	if (nvlist)
 	nvlist_free(nvlist);
 	return (error);
 }

lib/libzfs/libzfs_import.c

@@ -1973,7 +1973,6 @@ error:
 			venext = ve->ve_next;
 			for (ce = ve->ve_configs; ce != NULL; ce = cenext) {
 				cenext = ce->ce_next;
-				if (ce->ce_config)
 				nvlist_free(ce->ce_config);
 				free(ce);
 			}

lib/libzfs/libzfs_pool.c

@@ -1146,11 +1146,8 @@ zpool_open(libzfs_handle_t *hdl, const char *pool)
 void
 zpool_close(zpool_handle_t *zhp)
 {
-	if (zhp->zpool_config)
 	nvlist_free(zhp->zpool_config);
-	if (zhp->zpool_old_config)
 	nvlist_free(zhp->zpool_old_config);
-	if (zhp->zpool_props)
 	nvlist_free(zhp->zpool_props);
 	free(zhp);
 }
@@ -1688,7 +1685,6 @@ zpool_import(libzfs_handle_t *hdl, nvlist_t *config, const char *newname,
 
 	ret = zpool_import_props(hdl, config, newname, props,
 	    ZFS_IMPORT_NORMAL);
-	if (props)
 	nvlist_free(props);
 	return (ret);
 }
@@ -2959,7 +2955,6 @@ zpool_vdev_split(zpool_handle_t *zhp, char *newname, nvlist_t **newroot,
 	    &children) != 0) {
 		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 		    "Source pool is missing vdev tree"));
-		if (zc_props)
 		nvlist_free(zc_props);
 		return (-1);
 	}
@@ -3108,9 +3103,7 @@ out:
 		free(varray);
 	}
 	zcmd_free_nvlists(&zc);
-	if (zc_props)
 	nvlist_free(zc_props);
-	if (newconfig)
 	nvlist_free(newconfig);
 	if (freelist) {
 		nvlist_free(*newroot);

lib/libzfs/libzfs_sendrecv.c

@@ -2545,7 +2545,6 @@ zfs_receive_package(libzfs_handle_t *hdl, int fd, const char *destname,
 
 out:
 	fsavl_destroy(stream_avl);
-	if (stream_nv)
 	nvlist_free(stream_nv);
 	if (softerr)
 		error = -2;

module/zfs/spa.c

@@ -6132,7 +6132,6 @@ spa_sync_config_object(spa_t *spa, dmu_tx_t *tx)
 
 	spa_config_exit(spa, SCL_STATE, FTAG);
 
-	if (spa->spa_config_syncing)
 	nvlist_free(spa->spa_config_syncing);
 	spa->spa_config_syncing = config;
 

module/zfs/spa_config.c

@@ -376,7 +376,6 @@ void
 spa_config_set(spa_t *spa, nvlist_t *config)
 {
 	mutex_enter(&spa->spa_props_lock);
-	if (spa->spa_config != NULL)
 	nvlist_free(spa->spa_config);
 	spa->spa_config = config;
 	mutex_exit(&spa->spa_props_lock);

module/zfs/zfs_ioctl.c

@@ -1536,8 +1536,6 @@ zfs_ioc_pool_import(zfs_cmd_t *zc)
 	}
 
 	nvlist_free(config);
-
-	if (props)
 	nvlist_free(props);
 
 	return (error);