fs/affs/file.c: remove obsolete pagesize check

linux kernel doesn't manage page sizes below 4kb.

Signed-off-by: Fabian Frederick <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

fs/affs/file.c

···
 #include <linux/aio.h>
 #include "affs.h"
 
-#if PAGE_SIZE < 4096
-#error PAGE_SIZE must be at least 4096
-#endif
-
 static struct buffer_head *affs_get_extblock_slow(struct inode *inode, u32 ext);
 
 static int