IB/qib: Fix sizeof checkpatch warnings

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
diff --git a/drivers/infiniband/hw/qib/qib_sysfs.c b/drivers/infiniband/hw/qib/qib_sysfs.c
index b9ccbda..81f56cd 100644
--- a/drivers/infiniband/hw/qib/qib_sysfs.c
+++ b/drivers/infiniband/hw/qib/qib_sysfs.c
@@ -586,8 +586,8 @@
 		container_of(device, struct qib_ibdev, ibdev.dev);
 	struct qib_devdata *dd = dd_from_dev(dev);
 
-	buf[sizeof dd->serial] = '\0';
-	memcpy(buf, dd->serial, sizeof dd->serial);
+	buf[sizeof(dd->serial)] = '\0';
+	memcpy(buf, dd->serial, sizeof(dd->serial));
 	strcat(buf, "\n");
 	return strlen(buf);
 }