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: NEgbert Eich <eich@suse.com>

fs/fat/fat_write.c

@@ -120,7 +120,6 @@ static int flush_fat_buffer(fsdata *mydata)
 	__u8 *bufptr = mydata->fatbuf;
 	__u32 startblock = mydata->fatbufnum * FATBUFBLOCKS;
 
-	fatlength *= mydata->sect_size;
 	startblock += mydata->fat_sect;
 
 	if (getsize > fatlength)