Memory leak fixes from @elisamanfrin.

Fixes issue #4.

src/auth.c

@@ -788,7 +788,9 @@ static int _handle_features_sasl(xmpp_conn_t * const conn,
 	    }
 	    xmpp_stanza_set_text(text, resource);
 	    xmpp_stanza_add_child(res, text);
+            xmpp_stanza_release(text);
 	    xmpp_stanza_add_child(bind, res);
+            xmpp_stanza_release(res);
 	    xmpp_free(conn->ctx, resource);
 	}
 

src/tls_openssl.c

@@ -87,6 +87,7 @@ tls_t *tls_new(xmpp_ctx_t *ctx, sock_t sock)
 
 void tls_free(tls_t *tls)
 {
+    SSL_free(tls->ssl);
     SSL_CTX_free(tls->ssl_ctx);
     xmpp_free(tls->ctx, tls);
     return;