Fixes for scan-build warnings. Fix possible memory leak in wolfSSL_DH_new on failure. Add null checks in integer.c for destination to make sure “dp” grows when NULL (even though never happens in real-use). Added suppression of wc_port.c warning “Value stored to 'ret' is never read”.

src/ssl.c

@@ -16133,6 +16133,7 @@ WOLFSSL_DH* wolfSSL_DH_new(void)
     if (wc_InitDhKey(key) != 0) {
         WOLFSSL_MSG("wolfSSL_DH_new InitDhKey failure");
         XFREE(key, NULL, DYNAMIC_TYPE_DH);
+        XFREE(external, NULL, DYNAMIC_TYPE_DH);
         return NULL;
     }
     external->internal = key;