GATTClass::end(): fix possible leak

Author: pennam

src/utility/GATT.cpp

@@ -70,21 +70,31 @@ void GATTClass::begin()
 
 void GATTClass::end()
 {
-  if (_genericAccessService->release() == 0)
+  if (_genericAccessService && _genericAccessService->release() == 0) {
     delete(_genericAccessService);
-  
-  if (_deviceNameCharacteristic->release() == 0)
+    _genericAccessService = NULL;
+  }
+
+  if (_deviceNameCharacteristic && _deviceNameCharacteristic->release() == 0) {
     delete(_deviceNameCharacteristic);
-  
-  if (_appearanceCharacteristic->release() == 0)
+    _deviceNameCharacteristic = NULL;
+  }
+
+  if (_appearanceCharacteristic && _appearanceCharacteristic->release() == 0) {
     delete(_appearanceCharacteristic);
-  
-  if (_genericAttributeService->release() == 0)
+    _appearanceCharacteristic = NULL;
+  }
+
+  if (_genericAttributeService && _genericAttributeService->release() == 0) {
     delete(_genericAttributeService);
-  
-  if (_servicesChangedCharacteristic->release() == 0)
+    _genericAttributeService = NULL;
+  }
+
+  if (_servicesChangedCharacteristic && _servicesChangedCharacteristic->release() == 0) {
     delete(_servicesChangedCharacteristic);
-  
+    _servicesChangedCharacteristic = NULL;
+  }
+
   clearAttributes();
 }