[S390] qdio: remove memset hack

Remove memset hack that relied on the layout of struct qdio_q
to avoid deletion of the slib pointer.

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.h b/drivers/s390/cio/qdio.h
index 48aa064..da80e9b 100644
--- a/drivers/s390/cio/qdio.h
+++ b/drivers/s390/cio/qdio.h
@@ -296,10 +296,8 @@
 	struct qdio_irq *irq_ptr;
 	struct sl *sl;
 	/*
-	 * Warning: Leave this member at the end so it won't be cleared in
-	 * qdio_fill_qs. A page is allocated under this pointer and used for
-	 * slib and sl. slib is 2048 bytes big and sl points to offset
-	 * PAGE_SIZE / 2.
+	 * A page is allocated under this pointer and used for slib and sl.
+	 * slib is 2048 bytes big and sl points to offset PAGE_SIZE / 2.
 	 */
 	struct slib *slib;
 } __attribute__ ((aligned(256)));