s390/qdio: use QDIO_IRQ_STATE_INACTIVE instead of 0

Don't rely on the numeric value of enum constants.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

drivers/s390/cio/qdio_setup.c

@@ -462,7 +462,8 @@ int qdio_setup_irq(struct qdio_irq *irq_ptr, struct qdio_initialize *init_data)
 	memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
 
 	irq_ptr->debugfs_dev = irq_ptr->debugfs_perf = NULL;
-	irq_ptr->sch_token = irq_ptr->state = irq_ptr->perf_stat_enabled = 0;
+	irq_ptr->sch_token = irq_ptr->perf_stat_enabled = 0;
+	irq_ptr->state = QDIO_IRQ_STATE_INACTIVE;
 
 	/* wipes qib.ac, required by ar7063 */
 	memset(irq_ptr->qdr, 0, sizeof(struct qdr));