isofs: cleanup mount option processing

Remove unused variables from isofs_sb_info (used to be some mount
options), unify variables for option to use 0/1 (some options used
'y'/'n'), use bit fields for option flags in superblock.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/isofs/dir.c b/fs/isofs/dir.c
index 2f0dc5a..8ba5441 100644
--- a/fs/isofs/dir.c
+++ b/fs/isofs/dir.c
@@ -195,9 +195,8 @@
 		 * Do not report hidden files if so instructed, or associated
 		 * files unless instructed to do so
 		 */
-		if ((sbi->s_hide == 'y' &&
-				(de->flags[-sbi->s_high_sierra] & 1)) ||
-				(sbi->s_showassoc =='n' &&
+		if ((sbi->s_hide && (de->flags[-sbi->s_high_sierra] & 1)) ||
+		    (!sbi->s_showassoc &&
 				(de->flags[-sbi->s_high_sierra] & 4))) {
 			filp->f_pos += de_len;
 			continue;