usb: gadget: Move kstrtox() out of lock

The kstrtox() calls operate on local (to the function) variables and do
not need to be serialized. We may call them out of the lock.

Reviewed-by: John Keeping <john@metanate.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230120182434.24245-1-andriy.shevchenko@linux.intel.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>