[media] exynos-gsc: fix variable type in gsc_m2m_device_run()

In gsc_m2m_device_run(), variable "ret" is accepting signed integer
values. But currently it is defined as u32. This patch will modify
the type of "ret" variable to "int".
Signed-off-by: NShaik Ameer Basha <shaik.ameer@samsung.com>
Signed-off-by: NSylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/platform/exynos-gsc/gsc-m2m.c

@@ -122,7 +122,7 @@ static void gsc_m2m_device_run(void *priv)
 	struct gsc_ctx *ctx = priv;
 	struct gsc_dev *gsc;
 	unsigned long flags;
-	u32 ret;
+	int ret;
 	bool is_set = false;
 
 	if (WARN(!ctx, "null hardware context\n"))