simplified code in the ogg decoder plugin
Return early when the player thread sent us a command. This saves one level of indentation.
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		@@ -232,32 +232,32 @@ static int oggvorbis_decode(struct decoder * decoder, InputStream * inStream)
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	callbacks.close_func = ogg_close_cb;
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	callbacks.tell_func = ogg_tell_cb;
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	if ((ret = ov_open_callbacks(&data, &vf, NULL, 0, callbacks)) < 0) {
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		if (decoder_get_command(decoder) != DECODE_COMMAND_STOP) {
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			switch (ret) {
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			case OV_EREAD:
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				errorStr = "read error";
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				break;
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			case OV_ENOTVORBIS:
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				errorStr = "not vorbis stream";
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				break;
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			case OV_EVERSION:
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				errorStr = "vorbis version mismatch";
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				break;
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			case OV_EBADHEADER:
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				errorStr = "invalid vorbis header";
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				break;
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			case OV_EFAULT:
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				errorStr = "internal logic error";
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				break;
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			default:
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				errorStr = "unknown error";
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				break;
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			}
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			ERROR("Error decoding Ogg Vorbis stream: %s\n",
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			      errorStr);
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			return -1;
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		if (decoder_get_command(decoder) != DECODE_COMMAND_NONE)
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			return 0;
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		switch (ret) {
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		case OV_EREAD:
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			errorStr = "read error";
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			break;
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		case OV_ENOTVORBIS:
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			errorStr = "not vorbis stream";
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			break;
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		case OV_EVERSION:
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			errorStr = "vorbis version mismatch";
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			break;
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		case OV_EBADHEADER:
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			errorStr = "invalid vorbis header";
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			break;
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		case OV_EFAULT:
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			errorStr = "internal logic error";
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			break;
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		default:
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			errorStr = "unknown error";
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			break;
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		}
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		return 0;
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		ERROR("Error decoding Ogg Vorbis stream: %s\n",
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		      errorStr);
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		return -1;
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	}
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	audio_format.bits = 16;
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