Qt: fix a wrong logic for the check of the fullscreen screen number

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/gui/qt/components/controller.cpp

@@ -986,7 +986,7 @@ void FullscreenControllerWidget::toggleFullwidth()
 
 int FullscreenControllerWidget::targetScreen()
 {
-    if( i_screennumber < 0 || i_screennumber > QApplication::desktop()->screenCount() )
+    if( i_screennumber < 0 || i_screennumber >= QApplication::desktop()->screenCount() )
         return QApplication::desktop()->screenNumber( p_intf->p_sys->p_mi );
     return i_screennumber;
 }

modules/gui/qt/main_interface.cpp

@@ -860,7 +860,7 @@ void MainInterface::setVideoFullScreen( bool fs )
          * than current number of screens, take screennumber where current interface
          * is
          */
-        if( numscreen == -1 || numscreen > QApplication::desktop()->screenCount() )
+        if( numscreen < 0 || numscreen >= QApplication::desktop()->screenCount() )
             numscreen = QApplication::desktop()->screenNumber( p_intf->p_sys->p_mi );
 
         QRect screenres = QApplication::desktop()->screenGeometry( numscreen );