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exportfs: properly reply to chdir() error when we speak 9p

when we got a bad root tree, we should speak the right language
and return a Rerror response instead of crapping ascii into
the 9p conversation.

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

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

@@ -249,8 +249,15 @@

 	}

 	else if(srv != nil) {

 		if(chdir(srv) < 0) {

+			ebuf[0] = '\0';

 			errstr(ebuf, sizeof ebuf);

-			fprint(0, "chdir(\"%s\"): %s\n", srv, ebuf);

+			r = getsbuf();

+			r->work.tag = NOTAG;

+			r->work.fid = NOFID;

+			r->work.type = Rerror;

+			r->work.ename = ebuf;

+			n = convS2M(&r->work, r->buf, messagesize);

+			write(0, r->buf, n);

 			DEBUG(DFD, "chdir(\"%s\"): %s\n", srv, ebuf);

 			exits(ebuf);

 		}