DPP: Fix a memory leak on Configurator keygen error path

The allocated configuration structure needs to be freed if the specified
curve is not supported.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>

src/common/dpp.c

@@ -5564,6 +5564,7 @@ dpp_keygen_configurator(const char *curve, const u8 *privkey,
 		if (!conf->curve) {
 			wpa_printf(MSG_INFO, "DPP: Unsupported curve: %s",
 				   curve);
+			os_free(conf);
 			return NULL;
 		}
 	}