Fix OGG Vorbis infinite error spam with corrupt file.

When OGG Vorbis encountered unreadable file, it emitted infinite error spam.
This PR returns the full number of frames in the case of error, to prevent infinite loop.

modules/vorbis/audio_stream_ogg_vorbis.cpp

@@ -144,7 +144,7 @@ int AudioStreamPlaybackOggVorbis::_mix_internal(AudioFrame *p_buffer, int p_fram
 }
 
 int AudioStreamPlaybackOggVorbis::_mix_frames_vorbis(AudioFrame *p_buffer, int p_frames) {
-	ERR_FAIL_COND_V(!ready, 0);
+	ERR_FAIL_COND_V(!ready, p_frames);
 	if (!have_samples_left) {
 		ogg_packet *packet = nullptr;
 		int err;
@@ -156,10 +156,10 @@ int AudioStreamPlaybackOggVorbis::_mix_frames_vorbis(AudioFrame *p_buffer, int p
 		}
 
 		err = vorbis_synthesis(&block, packet);
-		ERR_FAIL_COND_V_MSG(err != 0, 0, "Error during vorbis synthesis " + itos(err));
+		ERR_FAIL_COND_V_MSG(err != 0, p_frames, "Error during vorbis synthesis " + itos(err));
 
 		err = vorbis_synthesis_blockin(&dsp_state, &block);
-		ERR_FAIL_COND_V_MSG(err != 0, 0, "Error during vorbis block processing " + itos(err));
+		ERR_FAIL_COND_V_MSG(err != 0, p_frames, "Error during vorbis block processing " + itos(err));
 
 		have_packets_left = !packet->e_o_s;
 	}