change comparison function to be consistent.
(now qsort on sunos should stop crashing.)

src/cmd/ls.C

diff --git a/src/cmd/ls.C b/src/cmd/ls.C
index 8bdeab6..4423a87 100644
--- a/src/cmd/ls.C
+++ b/src/cmd/ls.C
@@ -282,7 +282,7 @@
 			i = strcmp(ad->name, bd->name);
 	}
 	if(i == 0)
-		i = (a<b? -1 : 1);
+		i = (ad<bd? -1 : 1);
 	if(rflag)
 		i = -i;
 	return i;