selftests: gpio: gpio-sim: avoid forking test twice
Use '-o' within [] in order to avoid spawning two processes for test. Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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