delete not valid provider instances (fix memory leaks),

avoid failure due to assertion calling disconnectDb on PG provider more times

Author: brushtyler

src/core/qgsproviderregistry.cpp

@@ -400,6 +400,8 @@ QgsDataProvider *QgsProviderRegistry::provider( QString const & providerKey, QSt
           // necessarily a reflection on the data provider itself
           QgsDebugMsg( "Invalid data provider" );
 
+          delete dataProvider;
+
           myLib->unload();
           delete myLib;
           return 0;

src/providers/postgres/qgspostgresprovider.cpp

@@ -221,11 +221,13 @@ void QgsPostgresProvider::disconnectDb()
   if ( mConnectionRO )
   {
     mConnectionRO->disconnect();
+    mConnectionRO = 0;
   }
 
   if ( mConnectionRW )
   {
     mConnectionRW->disconnect();
+    mConnectionRW = 0;
   }
 }
 
@@ -2870,7 +2872,7 @@ bool QgsPostgresProvider::getGeometryDetails()
     mEnabledCapabilities &= ~( QgsVectorDataProvider::ChangeGeometries | QgsVectorDataProvider::AddFeatures );
   }
 
-  QgsDebugMsg( QString( "Feature type name is %1" ).arg( QGis::qgisFeatureTypes[ geometryType()] ) );
+  QgsDebugMsg( QString( "Feature type name is %1" ).arg( QGis::qgisFeatureTypes[ geometryType() ] ) );
   QgsDebugMsg( QString( "Geometry is geography %1" ).arg( mIsGeography ) );
 
   return mValid;