configure: Check gfio test result via return value (not printf)

Test code compiled by compile_prog() mostly return 0 on success
whether binaries are executed or not. This one actually runs and
the result can be checked without printf.

Signed-off-by: Tomohiro Kusumi <tkusumi@tuxera.com>
Signed-off-by: Jens Axboe <axboe@fb.com>