fix friendly name buffer leak in xmlSecMSCngX509GetFriendlyNameUnicode (#1198)

Author: dxbjavid

src/mscng/x509vfy.c

@@ -1503,6 +1503,7 @@ xmlSecMSCngX509GetFriendlyNameUnicode(PCCERT_CONTEXT cert) {
         &dwPropSize);
     if ((ret != TRUE) || (dwPropSize <= 0)) {
         xmlSecMSCngLastError("CertGetCertificateContextProperty", NULL);
+        xmlFree(pbFriendlyName);
         return(NULL);
     }