Fixed a possible nullptr dereference in the Android runtime permission code

modules/juce_audio_utils/gui/juce_AudioDeviceSelectorComponent.cpp

@@ -1196,7 +1196,13 @@ void AudioDeviceSelectorComponent::updateAllControls()
 void AudioDeviceSelectorComponent::buttonClicked (Button* btn)
 {
     if (bluetoothButton == btn)
-        BluetoothMidiDevicePairingDialogue::open();
+    {
+        if (! RuntimePermissions::isGranted (RuntimePermissions::bluetoothMidi))
+            RuntimePermissions::request (RuntimePermissions::bluetoothMidi, nullptr);
+
+        if (RuntimePermissions::isGranted (RuntimePermissions::bluetoothMidi))
+            BluetoothMidiDevicePairingDialogue::open();
+    }
 }
 
 ListBox* AudioDeviceSelectorComponent::getMidiInputSelectorListBox() const noexcept

modules/juce_core/native/juce_android_RuntimePermissions.cpp

@@ -40,7 +40,9 @@ namespace
         }
 
         std::unique_ptr<RuntimePermissions::Callback> uptr (callbackPtr);
-        (*uptr) (permissionWasGranted);
+
+        if (RuntimePermissions::Callback callbackObj = *uptr)
+            callbackObj (permissionWasGranted);
     }
 }