Apply Vladimir's latest cleanup patch.
 -Erik
diff --git a/echo.c b/echo.c
index 1ca3734..31c0315 100644
--- a/echo.c
+++ b/echo.c
@@ -81,7 +81,7 @@
 
 just_echo:
 	while (argc > 0) {
-		char *arg = argv[0];
+		const char *arg = argv[0];
 		register int c;
 
 		while ((c = *arg++)) {