V4L/DVB (6953): Fix radio set frequency logic

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/video/tuner-core.c b/drivers/media/video/tuner-core.c
index 67b9ed1..35976e6 100644
--- a/drivers/media/video/tuner-core.c
+++ b/drivers/media/video/tuner-core.c
@@ -247,7 +247,7 @@
 		tuner_warn ("tuner type not set\n");
 		return;
 	}
-	if (analog_ops->set_params) {
+	if (NULL == analog_ops->set_params) {
 		tuner_warn ("tuner has no way to set radio frequency\n");
 		return;
 	}