media: bcm2835: unicam: Fix uninitialized warning

raspberrypi inclusion
category: feature
bugzilla: 50432

--------------------------------
Signed-off-by: NJacko Dirks <jdirks.linuxdev@gmail.com>
Signed-off-by: NFang Yafen <yafen@iscas.ac.cn>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/media/platform/bcm2835/bcm2835-unicam.c

@@ -1004,7 +1004,7 @@ const struct unicam_fmt *get_first_supported_format(struct unicam_device *dev)
 	struct v4l2_subdev_mbus_code_enum mbus_code;
 	const struct unicam_fmt *fmt = NULL;
 	unsigned int i;
-	int ret;
+	int ret = 0;
 
 	for (i = 0; ret != -EINVAL && ret != -ENOIOCTLCMD; ++i) {
 		memset(&mbus_code, 0, sizeof(mbus_code));