Fix some memory leaks.

Adjusted a unit test or two to make leaks easier to find, and then fixed
a few leaks.

Change-Id: I47a20df8de7cac113d34a2015f76a65ab957dedd
Reviewed-by: Dmytro Poplavskiy <dmytro.poplavskiy@nokia.com>

src/multimedia/camera/qcamerafocus.cpp

@@ -394,6 +394,7 @@ QCameraFocus::QCameraFocus(QCamera *camera):
 
 QCameraFocus::~QCameraFocus()
 {
+    delete d_ptr;
 }
 
 /*!