Staging: cpc-usb: fix build warnings

This fixes some build warnings in the cpc-usb driver.

Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/cpc-usb/cpc-usb_drv.c

···
 		goto error;
 	}
 	info("Allocated memory for %d messages (%lu kbytes)",
-	     CPC_MSG_BUF_CNT, (sizeof(CPC_MSG_T) * CPC_MSG_BUF_CNT) / 1000);
+	     CPC_MSG_BUF_CNT, (long unsigned int)(sizeof(CPC_MSG_T) * CPC_MSG_BUF_CNT) / 1000);
 	memset(chan->buf, 0, sizeof(CPC_MSG_T) * CPC_MSG_BUF_CNT);
 
 	ResetBuffer(chan);