libcamera: Remove unneeded semicolons

Comply with the coding style by removing lots of unneeded semicolons.
Fix a few other coding style violations on the lines touched by those
fixes.

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

test/camera/camera_test.cpp

@@ -45,4 +45,4 @@ void CameraTest::cleanup()
 
 	cm_->stop();
 	delete cm_;
-};
+}