Staging: comedi: cb_pcimdas.c: more Checkpatch cleanup

WARNING: braces {} are not necessary for single statement blocks
+		if (fifo_empty) {
+			break;
+		}

WARNING: braces {} are not necessary for single statement blocks
+	if (irq) {
+		printk(", irq %u", irq);
+	}

Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>