test: v4l2_videodevice: Prevent variable shadowing of format

Rename the scoped usage of the variable format while iterating the formats
as it shadows the outer scoped format which is used for specific testing.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

test/v4l2_videodevice/formats.cpp

@@ -55,10 +55,10 @@ protected:
 			{ V4L2_PIX_FMT_Y16_BE, "Y16 -BE" }
 		};
 
-		for (const auto &format : formats) {
-			if (V4L2PixelFormat(format.first).toString() != format.second) {
+		for (const auto &fmt : formats) {
+			if (V4L2PixelFormat(fmt.first).toString() != fmt.second) {
 				cerr << "Failed to convert V4L2PixelFormat"
-				     << utils::hex(format.first) << "to string"
+				     << utils::hex(fmt.first) << "to string"
 				     << endl;
 				return TestFail;
 			}