fix GPS fixme wrt deletion

src/gps/GPS.cpp

@@ -73,6 +73,13 @@ bool GPS::setup()
     return ok;
 }
 
+GPS::~GPS()
+{
+    // we really should unregister our sleep observer
+    notifySleepObserver.unobserve();
+    notifyDeepSleepObserver.unobserve();
+}
+
 // Allow defining the polarity of the WAKE output.  default is active high
 #ifndef GPS_WAKE_ACTIVE
 #define GPS_WAKE_ACTIVE 1
@@ -86,8 +93,8 @@ void GPS::wake()
 #endif
 }
 
-
-void GPS::sleep() {
+void GPS::sleep()
+{
 #ifdef PIN_GPS_WAKE
     digitalWrite(PIN_GPS_WAKE, GPS_WAKE_ACTIVE ? 0 : 1);
     pinMode(PIN_GPS_WAKE, OUTPUT);
@@ -158,7 +165,8 @@ uint32_t GPS::getWakeTime() const
         return t; // already maxint
 
     if (t == 0)
-        t = radioConfig.preferences.is_router ? 5 * 60 : 15 * 60; // Allow up to 15 mins for each attempt (probably will be much less if we can find sats) or less if a router
+        t = radioConfig.preferences.is_router ? 5 * 60 : 15 * 60; // Allow up to 15 mins for each attempt (probably will be much
+                                                                  // less if we can find sats) or less if a router
 
     t *= 1000; // msecs
 

src/gps/GPS.h

@@ -47,7 +47,7 @@ class GPS : private concurrency::OSThread
 
     GPS() : concurrency::OSThread("GPS") {}
 
-    virtual ~GPS() {} // FIXME, we really should unregister our sleep observer
+    virtual ~GPS();
 
     /** We will notify this observable anytime GPS state has changed meaningfully */
     Observable<const meshtastic::GPSStatus *> newStatus;