usb: chipidea: isr_reset_handler fix missing locking

Move spin_lock under the done label, so the
lock will also be pulled in the error paths.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
[rebased on top of the patchset]
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>