[OpenSSL]:'may be used uninitialized' warning

Hi,
when configuring libssh2 with high optimization, the gcc throws the following error:

````
/home/rahmanih/github/libssh2/src/openssl.c:381:19: warning: ‘type’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  381 |         *out_type = type;
      |         ~~~~~~~~~~^~~~~~
````

regards
Haithem.