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ftpd: fix nil pointer derefernece when ominiting arguments to opts command

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

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

@@ -485,6 +485,10 @@

 {

 	char *p;

+	if(arg == 0 || *arg == 0){

+		reply("501 Syntax error in parameters or arguments");

+		return 0;

+	}

 	if(p = strchr(arg, ' '))

 		*p = 0;

 	if(cistrcmp(arg, "UTF-8") == 0){

-- 

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