staging: usbip: Renaming pr_warning function

Eliminated the following warning "WARNING: Prefer pr_warn(... to
pr_warning(...)" by renaming the pr_warning function to pr_warn in
usbip_event.c file.

Signed-off-by: Lisa Nguyen <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/usbip/usbip_event.c

···
 
 	ud->eh = kthread_run(event_handler_loop, ud, "usbip_eh");
 	if (IS_ERR(ud->eh)) {
-		pr_warning("Unable to start control thread\n");
+		pr_warn("Unable to start control thread\n");
 		return PTR_ERR(ud->eh);
 	}