address reviewer's comments

Author: rizlik

src/internal.c

@@ -25964,11 +25964,10 @@ int SendData(WOLFSSL* ssl, const void* data, size_t sz)
         outputSz = wolfSSL_GetRecordSize(ssl, (word32)sz - sent, 1);
 #if defined(WOLFSSL_DTLS) && !defined(WOLFSSL_NO_DTLS_SIZE_CHECK)
         if (ssl->options.dtls) {
-            int mtu;
 #if defined(WOLFSSL_DTLS_MTU)
-            mtu = ssl->dtlsMtuSz;
+            int mtu = ssl->dtlsMtuSz;
 #else
-            mtu = MAX_MTU;
+            int mtu = MAX_MTU;
 #endif
             if (outputSz > mtu) {
                 error = DTLS_SIZE_ERROR;

tests/api/test_dtls.c

@@ -1516,6 +1516,10 @@ int test_dtls_mtu_fragment_headroom(void)
 #if !defined(WOLFSSL_AEAD_ONLY) && !defined(NO_AES) && !defined(NO_SHA)
         { wolfDTLSv1_2_client_method, wolfDTLSv1_2_server_method,
           "ECDHE-RSA-AES128-SHA", 0 },
+#ifdef WOLFSSL_DTLS_CID
+        { wolfDTLSv1_2_client_method, wolfDTLSv1_2_server_method,
+          "ECDHE-RSA-AES128-SHA", 1 },
+#endif
 #endif
 #endif
     };
@@ -1532,6 +1536,7 @@ int test_dtls_mtu_fragment_headroom(void)
         int ret;
 
         XMEMSET(&test_ctx, 0, sizeof(test_ctx));
+        XMEMSET(payload, 'A', sizeof(payload));
 
         ExpectIntEQ(test_memio_setup(&test_ctx, &ctx_c, &ctx_s, &ssl_c, &ssl_s,
                         params[i].client_meth, params[i].server_meth),