We would attempt to delete the AndroidCameraPrivate object twice if the
native call to open failed. On recent version of Android (~6.0), this
problem is harder to reproduce, as the camera is properly released when
the application goes into the background.
Task-number: QTBUG-53536
Change-Id: I064d276f9025924dfdb071aa52311d2b553c6953
Reviewed-by: Yoann Lopes <yoann.lopes@qt.io>