Lower max submit so the test will not fail with EINVAL when SQ size is > CQ size

Summary: Lower max submit so the test will not fail with EINVAL when SQ size is > CQ size

Reviewed By: kevin-vigor

Differential Revision: D26419746

fbshipit-source-id: f9cbd4bef06b314f43ab667646d9e5ef61999246

folly/experimental/io/test/IoUringBackendTest.cpp

@@ -512,6 +512,7 @@ TEST(IoUringBackend, SuccessCreateRetry) {
     folly::IoUringBackend::Options options;
     options.setCapacity(256 * 1024);
     options.setMinCapacity(16);
+    options.setMaxSubmit(8);
     folly::IoUringBackend backend(options);
   } catch (const folly::IoUringBackend::NotAvailable&) {
     bSuccess = false;