Update OpenFIREcommon.cpp - assign OLED.display pointer to nullptr

By assigning the OLED.display pointer to nullptr, the program works and the micro doesn't crash, even if the OLED display is not connected even if the pins are configured.

Author: alessandro-satanassi

OpenFIREmain/OpenFIREcommon.cpp

@@ -92,9 +92,14 @@ void FW_Common::FeedbackSet()
         // wrapper will manage display validity
         // check it's not using the camera's I2C line
         if(OF_Prefs::toggles[OF_Const::i2cOLED]) {
-            if(!OLED.Begin()) { if(OLED.display != nullptr) delete OLED.display; }
+            if(!OLED.Begin()) { 
+                if(OLED.display != nullptr) {
+                    delete OLED.display; 
+                    OLED.display = nullptr; 
+                }
+            }
         }
-    #endif // USES_DISPLAY
+     #endif // USES_DISPLAY
     }
 }