USB: Storage: usbat_check_status(): fix check-after-use

The Coverity checker spotted that we have already oops'ed if "us"
was NULL.

Since "us" can't be NULL in the only caller this patch removes the
NULL check.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/storage/shuttle_usbat.c

@@ -190,9 +190,6 @@ static int usbat_check_status(struct us_data *us)
 	unsigned char *reply = us->iobuf;
 	int rc;
 
-	if (!us)
-		return USB_STOR_TRANSPORT_ERROR;
-
 	rc = usbat_get_status(us, reply);
 	if (rc != USB_STOR_XFER_GOOD)
 		return USB_STOR_TRANSPORT_FAILED;