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skelfs: use more correct "file does not exist" error

--- a/sys/src/cmd/skelfs.c

+++ b/sys/src/cmd/skelfs.c

@@ -108,6 +108,8 @@

 	return nil;

 }

+static char Enonexist[] = "file does not exist";

+

 static char*

 fswalk1(Fid *old, char *name, void*)

 {

@@ -124,10 +126,10 @@

 		old->qid.vers = sessions++;

 		old->qid.path = mkqid(old->qid.vers, qtype(old->qid.path));

 	} else if(strcmp(name, s->name) != 0)

-		return "does not exist";

+		return Enonexist;

 	if(step(old, 1, &old->qid, nil) < 0)

-		return "does not exist";

+		return Enonexist;

 	return nil;

 }

@@ -169,7 +171,7 @@

 	Qid q;

 	if(step(r->fid, 0, &q, &r->d) < 0)

-		respond(r, "does not exist");

+		respond(r, Enonexist);

 	respond(r, nil);

 }