obs-qsv11: Remove leftover stack variable

plugins/obs-qsv11/QSV_Encoder.cpp

@@ -79,8 +79,6 @@ void qsv_encoder_version(unsigned short *major, unsigned short *minor)
 
 qsv_t *qsv_encoder_open(qsv_param_t *pParams)
 {
-	bool false_value = false;
-
 	QSV_Encoder_Internal *pEncoder = new QSV_Encoder_Internal(impl, ver);
 	mfxStatus sts = pEncoder->Open(pParams);
 	if (sts != MFX_ERR_NONE) {