usb: mdm_bridge: Decrement PM-usage counter in completion handler

mdm bridge control driver increments the PM usage counter before
submitting the tx URB, but counter was never decremented after that,
which prevents the device from entering suspend.

Change-Id: I3bf9cf0de876a53c21cc0edd8fdeeb0fe20a4905
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
1 file changed