usnic: add missing params to show_help() call

Signed-off-by: Jeff Squyres <jsquyres@cisco.com>

opal/mca/btl/usnic/btl_usnic_module.c

@@ -1804,7 +1804,8 @@ static int init_one_channel(opal_btl_usnic_module_t *module,
                        true,
                        opal_process_info.nodename,
                        module->linux_device_name,
-                       "failed to create CQ", __FILE__, __LINE__);
+                       "failed to create CQ", __FILE__, __LINE__,
+                       rc, fi_strerror(-rc));
         goto error;
     }