fix to "test script cleanup"
fix to "test script cleanup"

Fix commit 30f54ad295d58ff8c6d28c1fd612d23c2c343d19 which used
non-portable syntax for checking exit status.

Reviewed-by: Matt Caswell <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@openssl.org>

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl