extmod/modtls_mbedtls: Do gc_collect and retry ssl_init on any error.

Contrary to the docs, mbedtls can return more than just
MBEDTLS_ERR_SSL_ALLOC_FAILED when `mbedtls_ssl_setup()` fails.  At least
MBEDTLS_ERR_MD_ALLOC_FAILED was also seen on ESP32_GENERIC, but there
could possibly be other error codes.

To cover all these codes, just check if `ret` is non-0, and in that case
do a `gc_collect()` and retry the init.

Signed-off-by: Damien George <[email protected]>

Author: dpgeorge

extmod/modtls_mbedtls.c

@@ -639,7 +639,7 @@ static mp_obj_t ssl_socket_make_new(mp_obj_ssl_context_t *ssl_context, mp_obj_t
 
     ret = mbedtls_ssl_setup(&o->ssl, &ssl_context->conf);
     #if !MICROPY_MBEDTLS_CONFIG_BARE_METAL
-    if (ret == MBEDTLS_ERR_SSL_ALLOC_FAILED) {
+    if (ret != 0) {
         // If mbedTLS relies on platform libc heap for buffers (i.e. esp32
         // port), then run a GC pass and then try again. This is useful because
         // it may free a Python object (like an old SSL socket) whose finaliser