openssl: free UI_METHOD on exit path

In providercheck(), when failing to open the "store", the exit path
would not previously free the created UI_METHOD and instead leak this
resource.

Pointed out by ZeroPath

Closes #19114

lib/vtls/openssl.c

@@ -1328,6 +1328,7 @@ static int providercheck(struct Curl_easy *data,
       failf(data, "Failed to open OpenSSL store: %s",
             ossl_strerror(ERR_get_error(), error_buffer,
                           sizeof(error_buffer)));
+      UI_destroy_method(ui_method);
       return 0;
     }
     if(OSSL_STORE_expect(store, OSSL_STORE_INFO_PKEY) != 1) {