wbemprox: Avoid assigning COM objects to interface variables.

dlls/wbemprox/class.c

@@ -78,7 +78,7 @@ static HRESULT WINAPI enum_class_object_QueryInterface(
     if ( IsEqualGUID( riid, &IID_IEnumWbemClassObject ) ||
          IsEqualGUID( riid, &IID_IUnknown ) )
     {
-        *ppvObject = ec;
+        *ppvObject = &ec->IEnumWbemClassObject_iface;
     }
     else if ( IsEqualGUID( riid, &IID_IClientSecurity ) )
     {
@@ -324,7 +324,7 @@ static HRESULT WINAPI class_object_QueryInterface(
     if ( IsEqualGUID( riid, &IID_IWbemClassObject ) ||
          IsEqualGUID( riid, &IID_IUnknown ) )
     {
-        *ppvObject = co;
+        *ppvObject = &co->IWbemClassObject_iface;
     }
     else if (IsEqualGUID( riid, &IID_IClientSecurity ))
     {

dlls/wbemprox/qualifier.c

@@ -79,7 +79,7 @@ static HRESULT WINAPI qualifier_set_QueryInterface(
     if ( IsEqualGUID( riid, &IID_IWbemQualifierSet ) ||
          IsEqualGUID( riid, &IID_IUnknown ) )
     {
-        *ppvObject = set;
+        *ppvObject = &set->IWbemQualifierSet_iface;
     }
     else
     {

dlls/wbemprox/services.c

@@ -52,7 +52,7 @@ static HRESULT WINAPI client_security_QueryInterface(
     if ( IsEqualGUID( riid, &IID_IClientSecurity ) ||
          IsEqualGUID( riid, &IID_IUnknown ) )
     {
-        *ppvObject = cs;
+        *ppvObject = &cs->IClientSecurity_iface;
     }
     else
     {
@@ -264,7 +264,7 @@ static HRESULT WINAPI wbem_services_QueryInterface(
     if ( IsEqualGUID( riid, &IID_IWbemServices ) ||
          IsEqualGUID( riid, &IID_IUnknown ) )
     {
-        *ppvObject = ws;
+        *ppvObject = &ws->IWbemServices_iface;
     }
     else if ( IsEqualGUID( riid, &IID_IClientSecurity ) )
     {