Fix crash on error: dont do av_buffer_unref on frame contex because device_ctx frees it as well

src/capture/nvfbc.c

@@ -172,7 +172,7 @@ static bool ffmpeg_create_cuda_contexts(gsr_capture_nvfbc *cap_nvfbc, AVCodecCon
         fprintf(stderr, "gsr error: cuda_create_codec_context failed: failed to initialize hardware frame context "
                         "(note: ffmpeg version needs to be > 4.0)\n");
         av_buffer_unref(&device_ctx);
-        av_buffer_unref(&frame_context);
+        //av_buffer_unref(&frame_context);
         return false;
     }
 

src/capture/xcomposite_cuda.c

@@ -126,7 +126,7 @@ static bool cuda_create_codec_context(gsr_capture_xcomposite_cuda *cap_xcomp, AV
         fprintf(stderr, "Error: Failed to initialize hardware frame context "
                         "(note: ffmpeg version needs to be > 4.0)\n");
         av_buffer_unref(&device_ctx);
-        av_buffer_unref(&frame_context);
+        //av_buffer_unref(&frame_context);
         cap_xcomp->cuda.cuCtxPopCurrent_v2(&old_ctx);
         return false;
     }

src/capture/xcomposite_drm.c

@@ -80,7 +80,7 @@ static bool drm_create_codec_context(gsr_capture_xcomposite_drm *cap_xcomp, AVCo
         fprintf(stderr, "Error: Failed to initialize hardware frame context "
                         "(note: ffmpeg version needs to be > 4.0)\n");
         av_buffer_unref(&device_ctx);
-        av_buffer_unref(&frame_context);
+        //av_buffer_unref(&frame_context);
         return false;
     }