small patch to dbgutil.c so that Payload is printed in hex

dbgutil.c.patch

diff --git a/tests/dbgutil.c b/tests/dbgutil.c
index 1335f93..b12fc19 100644
--- a/tests/dbgutil.c
+++ b/tests/dbgutil.c
@@ -45,7 +45,10 @@ void dump_data(const struct quirc_data *data)
        printf("    Data type: %d (%s)\n",
            data->data_type, data_type_str(data->data_type));
        printf("    Length: %d\n", data->payload_len);
-       printf("    Payload: %s\n", data->payload);
+       printf("    Payload: ");
+       for (int i = 0; i < data->payload_len; i++)
+               printf("%0x ", data->payload[i]);
+       printf("\n");
 
        if (data->eci)
                printf("    ECI: %d\n", data->eci);