usb: dwc3: pci: Fix reference count leak in dwc3_pci_resume_work

commit 2655971a

 upstream.

dwc3_pci_resume_work() calls pm_runtime_get_sync() that increments
the reference counter. In case of failure, decrement the reference
before returning.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>