libxl_json: fix build with DEBUG_ANSWER

Also replace LIBXL__LOG_DEBUG by XTL_DEBUG, because it's shorter and
more often used in libxl.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>

tools/libxl/libxl_json.c

@@ -59,8 +59,8 @@ struct libxl__yajl_ctx {
         const unsigned char *buf = NULL; \
         size_t len = 0; \
         yajl_gen_get_buf((yajl_ctx)->g, &buf, &len); \
-        LIBXL__LOG(libxl__gc_owner((yajl_ctx)->gc), LIBXL__LOG_DEBUG,
-		   "response:\n", buf); \
+        LIBXL__LOG(libxl__gc_owner((yajl_ctx)->gc), XTL_DEBUG, \
+		   "response: %s\n", buf); \
         yajl_gen_free((yajl_ctx)->g); \
         (yajl_ctx)->g = NULL; \
     } while (0)