init some vars with nullptr

Author: Berny23

src/frontend_manager.cpp

@@ -44,7 +44,7 @@ QString FrontendManager::get_error_message() const {
 
 void FrontendManager::set_error_message(const QString &message) {
     m_error_message = message;
-    Q_EMIT error_message_changed(); // TODO: Replace with thing that actually works
+    Q_EMIT error_message_changed();
 }
 
 QStringList FrontendManager::get_hrir_wav_file_names() const {

src/pipewire_manager.h

@@ -56,11 +56,11 @@ class PipeWireManager : public QObject {
     Q_SIGNAL void error_occured(const QString &message);
 
   private:
-    struct pw_thread_loop *thread_loop;
-    struct pw_context *context;
-    struct pw_core *core;
-    struct pw_registry *registry;
-    struct pw_metadata *metadata;
+    struct pw_thread_loop *thread_loop = nullptr;
+    struct pw_context *context = nullptr;
+    struct pw_core *core = nullptr;
+    struct pw_registry *registry = nullptr;
+    struct pw_metadata *metadata = nullptr;
     struct spa_hook registry_listener;
     struct spa_hook metadata_listener;
     struct spa_hook core_listener;