ReviveOverlay: Add assertions to ensure proper capacity.

Author: CrossVR

ReviveOverlay/windowsservices.cpp

@@ -114,6 +114,8 @@ bool WindowsServices::PromptCredentials(QString& user, QString& password, bool f
 user.resize(userSize - 1);
 password.reserve(passwordSize);
 password.resize(passwordSize - 1);
+Q_ASSERT(user.capacity() == userSize);
+Q_ASSERT(password.capacity() == passwordSize);
 
 CredUnPackAuthenticationBufferW(0,
 authBuffer, authSize,