btrfs-progs: remove NULL-ptr judge before free for btrfs-progs

free(3) already checks the pointer for NULL, no need to do it
on your own. This patch make the change globally.

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>

btrfs-convert.c

@@ -547,8 +547,7 @@ static int create_file_extents(struct btrfs_trans_handle *trans,
 					 data.first_block, data.checksum);
 	}
 fail:
-	if (buffer)
-		free(buffer);
+	free(buffer);
 	return ret;
 error:
 	fprintf(stderr, "ext2fs_block_iterate2: %s\n", error_message(err));
@@ -785,8 +784,7 @@ static int copy_single_xattr(struct btrfs_trans_handle *trans,
 	ret = btrfs_insert_xattr_item(trans, root, namebuf, name_len,
 				      data, datalen, objectid);
 out:
-	if (databuf)
-		free(databuf);
+	free(databuf);
 	return ret;
 }
 
@@ -892,8 +890,7 @@ static int copy_extended_attrs(struct btrfs_trans_handle *trans,
 		entry = EXT2_EXT_ATTR_NEXT(entry);
 	}
 out:
-	if (buffer != NULL)
-		free(buffer);
+	free(buffer);
 	if ((void *)ext2_inode != inode_buf)
 		free(ext2_inode);
 	return ret;

btrfs-list.c

@@ -399,8 +399,7 @@ static int update_root(struct root_lookup *root_lookup,
 	if (!ri || ri->root_id != root_id)
 		return -ENOENT;
 	if (name && name_len > 0) {
-		if (ri->name)
-			free(ri->name);
+		free(ri->name);
 
 		ri->name = malloc(name_len + 1);
 		if (!ri->name) {
@@ -515,15 +514,9 @@ static void __free_root_info(struct rb_node *node)
 	struct root_info *ri;
 
 	ri = rb_entry(node, struct root_info, rb_node);
-	if (ri->name)
-		free(ri->name);
-
-	if (ri->path)
-		free(ri->path);
-
-	if (ri->full_path)
-		free(ri->full_path);
-
+	free(ri->name);
+	free(ri->path);
+	free(ri->full_path);
 	free(ri);
 }
 

cmds-subvolume.c

@@ -949,22 +949,16 @@ static int cmd_subvol_show(int argc, char **argv)
 			1, raw_prefix);
 
 	/* clean up */
-	if (get_ri.path)
-		free(get_ri.path);
-	if (get_ri.name)
-		free(get_ri.name);
-	if (get_ri.full_path)
-		free(get_ri.full_path);
-	if (filter_set)
-		btrfs_list_free_filter_set(filter_set);
+	free(get_ri.path);
+	free(get_ri.name);
+	free(get_ri.full_path);
+	btrfs_list_free_filter_set(filter_set);
 
 out:
 	close_file_or_dir(fd, dirstream1);
 	close_file_or_dir(mntfd, dirstream2);
-	if (mnt)
-		free(mnt);
-	if (fullpath)
-		free(fullpath);
+	free(mnt);
+	free(fullpath);
 	return !!ret;
 }
 

free-space-cache.c

@@ -781,8 +781,7 @@ void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl)
 	while ((node = rb_last(&ctl->free_space_offset)) != NULL) {
 		info = rb_entry(node, struct btrfs_free_space, offset_index);
 		unlink_free_space(ctl, info);
-		if (info->bitmap)
-			free(info->bitmap);
+		free(info->bitmap);
 		free(info);
 	}
 }

mkfs.c

@@ -721,8 +721,7 @@ again:
 		goto again;
 
 end:
-	if (eb)
-		free(eb);
+	free(eb);
 	close(fd);
 	return ret;
 }

volumes.c

@@ -1267,13 +1267,11 @@ int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
 again:
 	ce = search_cache_extent(&map_tree->cache_tree, logical);
 	if (!ce) {
-		if (multi)
-			kfree(multi);
+		kfree(multi);
 		return -ENOENT;
 	}
 	if (ce->start > logical || ce->start + ce->size < logical) {
-		if (multi)
-			kfree(multi);
+		kfree(multi);
 		return -ENOENT;
 	}