test/ring-leak.c: kick UNIX garbage collection
test/ring-leak.c: kick UNIX garbage collection

Provide a more deterministic runtime by avoiding waiting for a random
GC run. This can take a long time depending on what is going on in
the host, it's been observed to even timeout the test.

Signed-off-by: Jens Axboe <cd8c6775e60d6f67a6984377324e5290df3d5358@kernel.dk>

axboe/liburing,axboe/liburing,axboe/liburing