radeon/vce: fix vui time_scale zero error

if app pass 0 as frame_rate_num, it should not be encoded to the VUI.

Signed-off-by: Leo Liu <leo.liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Cc: "10.6 11.0" <mesa-stable@lists.freedesktop.org>

src/gallium/drivers/radeon/radeon_vce_40_2_2.c

@@ -233,6 +233,9 @@ static void vui(struct rvce_encoder *enc)
 {
 	int i;
 
+	if (!enc->pic.rate_ctrl.frame_rate_num)
+		return;
+
 	RVCE_BEGIN(0x04000009); // vui
 	RVCE_CS(0x00000000); //aspectRatioInfoPresentFlag
 	RVCE_CS(0x00000000); //aspectRatioInfo.aspectRatioIdc