IB/hfi1: Suppress a compiler warning

Avoid that the following compiler warning is reported when building
with gcc 8:

drivers/infiniband/hw/hfi1/verbs.c:1896:2: warning: 'strncpy' output may be truncated copying 64 bytes from a string of length 64 [-Wstringop-truncation]
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/hfi1/verbs.c

@@ -1884,7 +1884,7 @@ int hfi1_register_ib_device(struct hfi1_devdata *dd)
 	ibdev->process_mad = hfi1_process_mad;
 	ibdev->get_dev_fw_str = hfi1_get_dev_fw_str;
 
-	strncpy(ibdev->node_desc, init_utsname()->nodename,
+	strlcpy(ibdev->node_desc, init_utsname()->nodename,
 		sizeof(ibdev->node_desc));
 
 	/*