cgiwifi.c: changed DBG() format string

esp-link/cgiwifi.c

@@ -31,7 +31,7 @@ Cgi/template routines for the /wifi url.
 	char buffer[128];			\
 	os_sprintf(buffer, format, ## __VA_ARGS__);	\
 	syslog(SYSLOG_FAC_USER, severity, "WIFI", buffer);                          \
-	DBG("WIFI %s\n", buffer);	\
+	DBG("%s %s\n", "WIFI", buffer);	                                            \
 } while(0)
 
 #define NOTICE(format, ...) do {	\