Laurent Pinchart 96980e35ae qcam: Don't crash if camera can't be opened ...

If the camera specified on the command line can't be opened, the
MainWindow constructor still proceeds to check the startStopAction_,
which results in MainWindow::startCapture() being called and trying to
use a null camera_ object. Fix this by returning from the constructor as
soon as the error is detected.

This also fixes a similar crash if the camera selection dialog box is
closed without selecting a camera.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Umang Jain <email@uajain.com>

2020-04-27 20:18:18 +03:00

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