USB: core: only clean up what we allocated

When cleaning up the configurations, make sure we only free the number
of configurations and interfaces that we could have allocated.

Change-Id: I81b9513cc2ccc8bdd5e98982bb66e34711f61883
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Git-repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Git-commit: 32fd87b3
Signed-off-by: Dennis Cagle <dcagle@codeaurora.org>