fix some minor compiler warnings. Note: The 'delete' is actually safe, so we suppress the warning.

src/modules/Telemetry/Sensor/DFRobotGravitySensor.cpp

@@ -13,7 +13,10 @@ DFRobotGravitySensor::DFRobotGravitySensor() : TelemetrySensor(meshtastic_Teleme
 DFRobotGravitySensor::~DFRobotGravitySensor()
 {
     if (gravity) {
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdelete-non-virtual-dtor"
         delete gravity;
+#pragma GCC diagnostic pop
         gravity = nullptr;
     }
 }

src/power.h

@@ -138,7 +138,7 @@ class Power : private concurrency::OSThread
     void reboot();
     // open circuit voltage lookup table
     uint8_t low_voltage_counter;
-    int32_t lastLogTime = 0;
+    uint32_t lastLogTime = 0;
 #ifdef DEBUG_HEAP
     uint32_t lastheap;
 #endif