"bogus directory-entries per block" was reported for what was instead
bogus number of directory entries. The message also mismatched the
argument passed to printk(), which was sbi->dir_entries.

Fix this by replacing the message with "bogus number of directory
entries". printk() argument was kept unchanged.
Signed-off-by: NZheng Lv <lv.zheng.2015@gmail.com>
Acked-by: NOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>