greybus: svc: fix hot-plug-state allocation flag

Use GFP_KERNEL for hot-plug state allocation in
gb_svc_intf_hotplug_recv, which is called from a request handler (i.e.
a work queue).
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>

drivers/staging/greybus/svc.c

@@ -382,7 +382,7 @@ static int gb_svc_intf_hotplug_recv(struct gb_operation *op)
 		return -EINVAL;
 	}
 
-	svc_hotplug = kmalloc(sizeof(*svc_hotplug), GFP_ATOMIC);
+	svc_hotplug = kmalloc(sizeof(*svc_hotplug), GFP_KERNEL);
 	if (!svc_hotplug)
 		return -ENOMEM;