fix cppcheck

lib/PowerManagement/power_management.cpp

@@ -1,7 +1,7 @@
 
 #include "power_management.h"
 
-PowerManagement::PowerManagement() {
+PowerManagement::PowerManagement() : axp() {
 }
 
 bool PowerManagement::begin(TwoWire &port) {

src/TaskAprsIs.cpp

@@ -30,9 +30,11 @@ bool AprsIsTask::loop(System &system) {
     return false;
   }
 
-  std::shared_ptr<APRSMessage> msg = _aprs_is.getAPRSMessage();
-  if (msg) {
-    _toModem.addElement(msg);
+  {
+    std::shared_ptr<APRSMessage> msg = _aprs_is.getAPRSMessage();
+    if (msg) {
+      _toModem.addElement(msg);
+    }
   }
 
   if (!_toAprsIs.empty()) {

src/TaskMQTT.h

@@ -8,7 +8,7 @@
 
 class MQTTTask : public Task {
 public:
-  MQTTTask(TaskQueue<std::shared_ptr<APRSMessage>> &toMQTT);
+  explicit MQTTTask(TaskQueue<std::shared_ptr<APRSMessage>> &toMQTT);
   virtual ~MQTTTask();
 
   virtual bool setup(System &system) override;