[S390] qdio: count number of qdio interrupts

Add missing increment for the qdio interrupt counter.

Signed-off-by: Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
index 88be7b9..1fc8126 100644
--- a/drivers/s390/cio/qdio_main.c
+++ b/drivers/s390/cio/qdio_main.c
@@ -955,6 +955,9 @@
 		return;
 	}
 
+	if (irq_ptr->perf_stat_enabled)
+		irq_ptr->perf_stat.qdio_int++;
+
 	if (IS_ERR(irb)) {
 		switch (PTR_ERR(irb)) {
 		case -EIO: