Prevent out of bounds parameter touch in carla-native plugin

Fixes #992

Signed-off-by: falkTX <falktx@falktx.com>

source/backend/engine/CarlaEngineNative.cpp

@@ -366,7 +366,7 @@ public:
         }
     }
 
-    void setParameterTouchFromUI(const uint32_t pluginId, uint32_t index, const bool touch)
+    void setParameterTouchFromUI(const uint32_t pluginId, const uint32_t index, const bool touch)
     {
         uint32_t rindex = index;
         if (_getRealIndexForPluginParameter(pluginId, rindex))
@@ -1714,6 +1714,9 @@ private:
             rindex += plugin->getParameterCount();
         }
 
+        if (rindex >= kNumInParams)
+            return false;
+
         return true;
     }