test/fiber/test_io_buffer.rb: fix file descriptor leaks
I got the warning while running "make test-all":
Leaked file descriptor: TestFiberIOBuffer#test_write_nonblock: 9 : #<UNIXSocket:fd 9> Closed file descriptor: TestFiberIOBuffer#test_read_write_blocking: 9 Leaked file descriptor: TestFiberIOBuffer#test_timeout_after: 10 : #<UNIXSocket:fd 10> Closed file descriptor: TestFiberIOBuffer#test_read_nonblock: 10
test/fiber/test_io_buffer.rb: fix file descriptor leaks
I got the warning while running "make test-all":