make error more clear about missing trunk_type param in openzap.conf (and auto tolerate the err) and fix printf metas

git-svn-id: http://svn.openzap.org/svn/openzap/trunk@621 a93c3328-9c30-0410-af19-c9cd2b2d52af

libs/openzap/src/zap_io.c

@@ -2482,6 +2482,7 @@ zap_status_t zap_configure_span(const char *type, zap_span_t *span, zio_signal_c
 		va_end(ap);
 	} else {
 		zap_log(ZAP_LOG_ERROR, "can't find '%s'\n", type);
+		status = ZAP_FAIL;
 	}
 
 	return status;