Fix: Leak of a CVPixelBufferRef in RTCVideoEncoderH264.

Bug: webrtc:9347
Change-Id: I6e7497dac01b778964088ec24687ef5c495ae6e7
Reviewed-on: https://webrtc-review.googlesource.com/80461
Reviewed-by: Anders Carlsson <andersc@webrtc.org>
Commit-Queue: Peter Hanspers <peterhanspers@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23492}
diff --git a/sdk/objc/Framework/Classes/VideoToolbox/RTCVideoEncoderH264.mm b/sdk/objc/Framework/Classes/VideoToolbox/RTCVideoEncoderH264.mm
index ffdbd9d..1ebf701 100644
--- a/sdk/objc/Framework/Classes/VideoToolbox/RTCVideoEncoderH264.mm
+++ b/sdk/objc/Framework/Classes/VideoToolbox/RTCVideoEncoderH264.mm
@@ -390,6 +390,7 @@
       }
       _frameScaleBuffer.shrink_to_fit();
       if (![rtcPixelBuffer cropAndScaleTo:pixelBuffer withTempBuffer:_frameScaleBuffer.data()]) {
+        CVBufferRelease(pixelBuffer);
         return WEBRTC_VIDEO_CODEC_ERROR;
       }
     }