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proper error message when no service set

--- a/sys/src/cmd/cwfs/main.c

+++ b/sys/src/cmd/cwfs/main.c

@@ -174,6 +174,9 @@

 	char buf[3*NAMELEN];

 	int p[2];

+	if(service[0] == 0)

+		panic("no service name");

+

 	if(sfd < 0){

 		if(pipe(p) < 0)

 			panic("can't make a pipe");

@@ -290,6 +293,7 @@

 	formatinit();

 	machinit();

 	conf.confdev = "/dev/sdC0/cwfs";

+	strcpy(service, "cwfs");

 	rfd = sfd = -1;

-- 

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