BareMetal: Fix crash on shutdown

Change-Id: I40c2381f5d70d57c8bb7b6d4727a5350a52eefc5
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/baremetal/baremetaldevice.cpp

@@ -83,6 +83,12 @@ void BareMetalDevice::setGdbServerProviderId(const QString &id)
     }
 }
 
+void BareMetalDevice::unregisterProvider(GdbServerProvider *provider)
+{
+    if (provider->id() == m_gdbServerProviderId)
+        m_gdbServerProviderId.clear();
+}
+
 void BareMetalDevice::providerUpdated(GdbServerProvider *provider)
 {
     GdbServerProvider *myProvider = GdbServerProviderManager::findProvider(m_gdbServerProviderId);

src/plugins/baremetal/baremetaldevice.h

@@ -59,6 +59,7 @@ public:
 
     QString gdbServerProviderId() const;
     void setGdbServerProviderId(const QString &id);
+    void unregisterProvider(GdbServerProvider *provider);
     void providerUpdated(GdbServerProvider *provider);
 
     virtual void fromMap(const QVariantMap &map) override;

src/plugins/baremetal/gdbserverprovider.cpp

@@ -78,7 +78,7 @@ GdbServerProvider::~GdbServerProvider()
 {
     const QSet<BareMetalDevice *> devices = m_devices;
     for (BareMetalDevice *device : devices)
-        device->setGdbServerProviderId(QString());
+        device->unregisterProvider(this);
 }
 
 QString GdbServerProvider::displayName() const