fs/fat: Don't multiply fatsize with sector size

Bugfix:
Here at this place we need the fat size in sectors not bytes.
This was found during code review when adding support for storage
devices with blocksizes != 512.

Signed-off-by: Egbert Eich <eich@suse.com>
diff --git a/fs/fat/fat_write.c b/fs/fat/fat_write.c
index b4022aa..fd07240 100644
--- a/fs/fat/fat_write.c
+++ b/fs/fat/fat_write.c
@@ -120,7 +120,6 @@
 	__u8 *bufptr = mydata->fatbuf;
 	__u32 startblock = mydata->fatbufnum * FATBUFBLOCKS;
 
-	fatlength *= mydata->sect_size;
 	startblock += mydata->fat_sect;
 
 	if (getsize > fatlength)