Fix some clazy eventFilter warnings

Author: nyalldawson

src/gui/attributetable/qgsattributetableview.cpp

@@ -83,7 +83,7 @@ bool QgsAttributeTableView::eventFilter( QObject *object, QEvent *event )
         break;
     }
   }
-  return false;
+  return QTableView::eventFilter( object, event );
 }
 
 void QgsAttributeTableView::setAttributeTableConfig( const QgsAttributeTableConfig &config )

src/gui/qgsadvanceddigitizingdockwidget.cpp

@@ -785,12 +785,12 @@ bool QgsAdvancedDigitizingDockWidget::eventFilter( QObject *obj, QEvent *event )
   Q_UNUSED( obj );
   if ( event->type() != QEvent::KeyPress )
   {
-    return false;
+    return QgsDockWidget::eventFilter( obj, event );
   }
   QKeyEvent *keyEvent = dynamic_cast<QKeyEvent *>( event );
   if ( !keyEvent )
   {
-    return false;
+    return QgsDockWidget::eventFilter( obj, event );
   }
   return filterKeyPress( keyEvent );
 }

src/gui/qgscheckablecombobox.cpp

@@ -220,7 +220,7 @@ bool QgsCheckableComboBox::eventFilter( QObject *object, QEvent *event )
       return true;
     }
   }
-  return false;
+  return QComboBox::eventFilter( object, event );
 }
 
 void QgsCheckableComboBox::setCheckedItems( const QStringList &items )

src/gui/qgsorderbydialog.cpp

@@ -149,7 +149,7 @@ bool QgsOrderByDialog::eventFilter( QObject *obj, QEvent *e )
     }
   }
 
-  return false;
+  return QDialog::eventFilter( obj, e );
 }
 
 void QgsOrderByDialog::showHelp()