421216 - libpkix test nss_thread leaks a test certificate. r=nelson

security/nss/cmd/libpkix/perf/nss_threads.c

@@ -192,5 +192,6 @@ int nss_threads(int argc, char** argv)
                 }
         Test(cert, duration, threads);
 
+        CERT_DestroyCertificate(cert);
         return (0);
 }