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ftpd: import changes from sources

--- a/sys/src/cmd/ip/ftpd.c

+++ b/sys/src/cmd/ip/ftpd.c

@@ -1152,6 +1152,8 @@

 	int nf, r;

 	Dir *d;

+	if(arg == 0)

+		return reply("501 bad site command");

 	nf = tokenize(arg, f, nelem(f));

 	if(nf != 3 || cistrcmp(f[0], "chmod") != 0)

 		return reply("501 bad site command");

-- 

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