Revert some hacky code in previous commit, not needed

source/backend/CarlaEngine.hpp

@@ -1013,10 +1013,8 @@ public:
 
     /*!
      * Set last error.
-     *
-     * \note Will always return false for convenience
      */
-    bool setLastError(const char* const error);
+    void setLastError(const char* const error);
 
     // -------------------------------------------------------------------
     // Misc

source/backend/engine/CarlaEngine.cpp

@@ -1408,10 +1408,9 @@ const char* CarlaEngine::getLastError() const noexcept
     return (const char*)pData->lastError;
 }
 
-bool CarlaEngine::setLastError(const char* const error)
+void CarlaEngine::setLastError(const char* const error)
 {
     pData->lastError = error;
-    return false;
 }
 
 void CarlaEngine::setAboutToClose()