here's the error in action:
	; bunzip2 9pcf
	gunzip: can't open 9pcf: '9pcf' directory entry not found
this patch changes the error to properly identify bunzip2
as the executable.

Reference: /n/sources/patch/applied/bunzip2name
Date: Sun Aug 16 17:10:54 CES 2009
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/bzip2/bunzip2.c	Sun Aug 16 17:09:25 2009
+++ /sys/src/cmd/bzip2/bunzip2.c	Sun Aug 16 17:09:24 2009
@@ -60,7 +60,7 @@
 	infile = file;
 	ifd = open(file, OREAD);
 	if(ifd < 0){
-		fprint(2, "gunzip: can't open %s: %r\n", file);
+		fprint(2, "bunzip2: can't open %s: %r\n", file);
 		return 0;
 	}