adb: properly handle libusb_clear_halt failure.

The original code used continue to attempt to try to skip the current
device, but there was an loop between the outside one and the continue.
Move the device handling logic into a function and replace continue
with return.

Test: mma
Change-Id: Iaa7f4b5ddc26d2ce03f1172d37d6307190b44412
1 file changed