Need to free x509 in tests

src/ssl.c

@@ -46003,6 +46003,9 @@ int wolfSSL_PEM_write_bio_X509(WOLFSSL_BIO *bio, WOLFSSL_X509 *cert)
     /* write the PEM to BIO */
     ret = wolfSSL_BIO_write(bio, pem, pemSz);
     XFREE(pem, NULL, DYNAMIC_TYPE_TMP_BUFFER);
+    #ifdef WOLFSSL_SMALL_STACK
+    XFREE(der, NULL, DYNAMIC_TYPE_TMP_BUFFER);
+    #endif
 
     if (ret <= 0) return WOLFSSL_FAILURE;
     return WOLFSSL_SUCCESS;

tests/api.c

@@ -37659,6 +37659,7 @@ static void test_wolfSSL_PEM_write_bio_X509(void)
 #endif
     AssertIntEQ(wolfSSL_BIO_get_len(output), expectedLen);
 
+    X509_free(x509);
     BIO_free(input);
     BIO_free(output);