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This variable is set with the intention of being passed to the
subsequent strcmp() but something went wrong and it was left unused. Use
it now.

Fixes: 91581c4b

 ("gpio: virtuser: new virtual testing driver for the GPIO API")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202407092245.BPnW2mr6-lkp@intel.com/
Link: https://lore.kernel.org/r/20240709151235.90523-1-brgl@bgdev.pl

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>