Don't redefine calloc and free
#define mbedtls_calloc calloc
#define mbedtls_free free
#define mbedtls_exit exit
-#define mbedtls_calloc calloc
-#define mbedtls_free free
#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
#endif
