fs/affs: add prefix to some functions

secs_to_datestamp(time64_t secs, struct affs_date *ds);
prot_to_mode(u32 prot);
mode_to_prot(struct inode *inode);

were declared without affs_ prefix

Link: http://lkml.kernel.org/r/20170109191208.6085-6-fabf@skynet.be
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/affs/super.c

@@ -32,7 +32,7 @@ affs_commit_super(struct super_block *sb, int wait)
 	struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
 
 	lock_buffer(bh);
-	secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change);
+	affs_secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change);
 	affs_fix_checksum(sb, bh);
 	unlock_buffer(bh);