test/eventfd-disable: Fix reading uninitialized variable
test/eventfd-disable: Fix reading uninitialized variable

Fix this:

  ==2256099== Conditional jump or move depends on uninitialised value(s)
  ==2256099==    at 0x109DF5: main (eventfd-disable.c:136)

Link: https://github.com/axboe/liburing/issues/640
Reported-by: Vitaly Chikunov <0d216168d6c4f83410e4fa17a56d762f8c0260fc@altlinux.org>
Signed-off-by: Ammar Faizi <a8266392a329a5c7b5ab982a8996391d75b6438e@gnuweeb.org>
Link: 0c017cda4bcef4efcd8a634470f456c31795315a@intel.com
Signed-off-by: Jens Axboe <cd8c6775e60d6f67a6984377324e5290df3d5358@kernel.dk>

axboe/liburing,axboe/liburing,axboe/liburing