Fix from review

Author: embhorn

tests/api/test_tls13.c

@@ -4590,7 +4590,7 @@ int test_tls13_empty_record_limit(void)
     struct test_memio_ctx test_ctx;
     WOLFSSL_CTX *ctx_c = NULL, *ctx_s = NULL;
     WOLFSSL *ssl_c = NULL, *ssl_s = NULL;
-    int recSz;
+    int recSz = 0;
     /* Send exactly WOLFSSL_MAX_EMPTY_RECORDS to pin the boundary check.
      * The Nth record increments the counter to N, and `N >= N` triggers
      * the error. Sending one more would let a `>=` -> `>` mutation survive