V4L/DVB (9283): Correct typo and enable setting the gain on the mt9m111 sensor

A typo was introduced during the gspca conversion, crippling the ability to control the gain on the mt9m111 sensor.
Signed-off-by: Erik Andrén <erik.andren@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/m5602/m5602_mt9m111.h

@@ -151,8 +151,8 @@ static struct m5602_sensor mt9m111 = {
 			.default_value  = DEFAULT_GAIN,
 			.flags          = V4L2_CTRL_FLAG_SLIDER
 		},
-		.set = mt9m111_set_hflip,
-		.get = mt9m111_get_hflip
+		.set = mt9m111_set_gain,
+		.get = mt9m111_get_gain
 	}
 	},