[PATCH -next] btrfs: remove set but not used variable 'root_objectid'

[YueHaibing]

fs/btrfs/inode.c: In function btrfs_rename:
fs/btrfs/inode.c:9196:6: warning: variable root_objectid set but not used [-Wunused-but-set-variable]

commit f8b3030e0807 ("btrfs: rework arguments of btrfs_unlink_subvol")
left behind this unused variable.

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 fs/btrfs/inode.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 493c0fe..990f509 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -9204,7 +9204,6 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	struct inode *new_inode = d_inode(new_dentry);
 	struct inode *old_inode = d_inode(old_dentry);
 	u64 index = 0;
-	u64 root_objectid;
 	int ret;
 	u64 old_ino = btrfs_ino(BTRFS_I(old_inode));
 	bool log_pinned = false;
@@ -9331,7 +9330,6 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 		new_inode->i_ctime = current_time(new_inode);
 		if (unlikely(btrfs_ino(BTRFS_I(new_inode)) ==
 			     BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) {
-			root_objectid = BTRFS_I(new_inode)->location.objectid;
 			ret = btrfs_unlink_subvol(trans, new_dir, new_dentry);
 			BUG_ON(new_inode->i_nlink == 0);
 		} else {
-- 
2.7.4