Forget to set final argv entry to NULL, breaking sh.c amoung
other things...
diff --git a/busybox.c b/busybox.c
index c8c060b..8f27dfb 100644
--- a/busybox.c
+++ b/busybox.c
@@ -203,6 +203,7 @@
 	}
 	while(index<=index2)
 		*index++='\0';
+	argv[ps_index]=NULL;
 
 	return (main(argc, argv));
 }