btrfs: update comment at log_conflicting_inodes()

A comment at log_conflicting_inodes() mentions that we check the inode's
logged_trans field instead of using btrfs_inode_in_log() because the field
last_log_commit is not updated when we log that an inode exists and the
inode has the full sync flag (BTRFS_INODE_NEEDS_FULL_SYNC) set. The part
about the full sync flag is not true anymore since commit 9acc8103
("btrfs: fix unpersisted i_size on fsync after expanding truncate"), so
update the comment to not mention that part anymore.
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/tree-log.c

@@ -5092,8 +5092,8 @@ static int log_conflicting_inodes(struct btrfs_trans_handle *trans,
 		/*
 		 * Check the inode's logged_trans only instead of
 		 * btrfs_inode_in_log(). This is because the last_log_commit of
-		 * the inode is not updated when we only log that it exists and
-		 * it has the full sync bit set (see btrfs_log_inode()).
+		 * the inode is not updated when we only log that it exists (see
+		 * btrfs_log_inode()).
 		 */
 		if (BTRFS_I(inode)->logged_trans == trans->transid) {
 			spin_unlock(&BTRFS_I(inode)->lock);