testsuite_test: reset ready in between uses

[julek-wolfssl]

This should fix the constant intermittent failures in GH CI.

[devin-ai-integration]

🛟 Devin Lifeguard found 2 likely issues in this PR

• check-all-return-codes snippet snippet: Capture and check the return value of the new fprintf calls (e.g., if (fprintf(stderr, "connecting to %s:%d\n", ip, port) < 0) err_sys_with_errno("fprintf failed");) to ensure write errors are detected.
• check-return-codes snippet snippet: Check the definitions of FreeTcpReady() and InitTcpReady(); if either returns a status (e.g., int) indicating failure, capture the return value and handle or propagate it instead of ignoring it.

@julek-wolfssl
please take a look at the above issues which Devin flagged. Devin will not fix these issues automatically.

[dgarske]

Yay!

[dgarske]

Jenkins retest this please. FIPS test failure, no history kept (again, FIPS tests in Jenkins aren't keeping very many histories).