btrfs: Check error of btrfs_iget in btrfs_search_path_in_tree_user

The patch introducing the ioctl was not the latest version at the time
of merging to the mainline and needs a fixup from this patch.

Fixes: ba637a252d30 ("btrfs: Check error of btrfs_iget() in btrfs_search_path_in_tree_user")
Signed-off-by: NMisono Tomohiro <misono.tomohiro@jp.fujitsu.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/ioctl.c

@@ -2438,6 +2438,10 @@ static int btrfs_search_path_in_tree_user(struct inode *inode,
 			}
 
 			temp_inode = btrfs_iget(sb, &key2, root, NULL);
+			if (IS_ERR(temp_inode)) {
+				ret = PTR_ERR(temp_inode);
+				goto out;
+			}
 			ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC);
 			iput(temp_inode);
 			if (ret) {