fat: remove redundant assignment of 0 to slots

The variable slots is being assigned a value of zero that is never read,
slots is being updated again a few lines later.  Remove this redundant
assignment.

Cleans clang warning: Value stored to 'slots' is never read

Link: http://lkml.kernel.org/r/20171017140258.22536-1-colin.king@canonical.com
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/fat/dir.c

@@ -291,7 +291,6 @@ static int fat_parse_long(struct inode *dir, loff_t *pos,
 		}
 	}
 parse_long:
-	slots = 0;
 	ds = (struct msdos_dir_slot *)*de;
 	id = ds->id;
 	if (!(id & 0x40))