btrfs: drop useless inode i_flags copy and restore

The patch ("btrfs: start transaction in btrfs_ioctl_setflags()") used
btrfs_set_prop() instead of btrfs_set_prop_trans() by which now the
inode::i_flags update functions such as
btrfs_sync_inode_flags_to_i_flags() and btrfs_update_inode() is called
in btrfs_ioctl_setflags() instead of
btrfs_set_prop_trans()->btrfs_setxattr() as earlier. So the
inode::i_flags remains unmodified until the thread has checked all the
conditions. So drop the saved inode::i_flags in out_i_flags.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/ioctl.c

@@ -190,7 +190,6 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
 	unsigned int fsflags, old_fsflags;
 	int ret;
 	u64 old_flags;
-	unsigned int old_i_flags;
 	umode_t mode;
 	const char *comp = NULL;
 
@@ -214,7 +213,6 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
 	inode_lock(inode);
 
 	old_flags = binode->flags;
-	old_i_flags = inode->i_flags;
 	mode = inode->i_mode;
 
 	fsflags = btrfs_mask_fsflags_for_type(inode, fsflags);
@@ -339,7 +337,6 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
  out_drop:
 	if (ret) {
 		binode->flags = old_flags;
-		inode->i_flags = old_i_flags;
 	}
 
  out_unlock: