[media] ivtv: ivtv-driver: Replace 'flush_work_sync()'

Since commit 43829731d (workqueue: deprecate flush[_delayed]_work_sync()),
flush_work() should be used instead of flush_work_sync().

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/pci/ivtv/ivtv-driver.c

@@ -304,7 +304,7 @@ static void request_modules(struct ivtv *dev)
 
 static void flush_request_modules(struct ivtv *dev)
 {
-	flush_work_sync(&dev->request_module_wk);
+	flush_work(&dev->request_module_wk);
 }
 #else
 #define request_modules(dev)