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/qcameraimagecapture.cpp

@@ -178,6 +178,8 @@ QCameraImageCapture::~QCameraImageCapture()
 
     if (d->mediaObject)
         d->mediaObject->unbind(this);
+
+    delete d_ptr;
 }
 
 /*!