mbedtls: fix memory leak when destroying SSL connection data #626
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Using cURL 7.46 with mbedTLS 2.2.1 I've come across some memory leak according to Valgrind:
To fix this, I've added some missing mbedtls_xxx_free to Curl_mbedtls_close. I've also substituted some memcpy with the proper mbedtls_xxx_init function when available.