xfs: remove unused struct xfs_mount field m_fsname_len

The struct xfs_mount field m_fsname_len is not used anywhere, remove it.

Signed-off-by: Ian Kent <[e-mail]>
Reviewed-by: Christoph Hellwig <[e-mail]>
Reviewed-by: Darrick J. Wong <[e-mail]>
Signed-off-by: Darrick J. Wong <[e-mail]>

fs/xfs/xfs_mount.h

···
 
 	struct xfs_buf		*m_sb_bp;	/* buffer for superblock */
 	char			*m_fsname;	/* filesystem name */
-	int			m_fsname_len;	/* strlen of fs name */
 	char			*m_rtname;	/* realtime device name */
 	char			*m_logname;	/* external log device name */
 	int			m_bsize;	/* fs logical block size */

fs/xfs/xfs_super.c

···
 	mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
 	if (!mp->m_fsname)
 		return -ENOMEM;
-	mp->m_fsname_len = strlen(mp->m_fsname) + 1;
 
 	/*
 	 * Copy binary VFS mount flags we are interested in.