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sshnet: don't leak error string

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

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

@@ -1103,12 +1103,11 @@

 			break;

 		}

 		c = getclient(chan);

-		if(c == nil || c->state != Dialing){

-			free(s);

-			break;

+		if(c != nil && c->state == Dialing){

+			c->state = Closed;

+			hangupclient(c, s);

 		}

-		c->state = Closed;

-		hangupclient(c, s);

+		free(s);

 		break;

 	}

 	free(m);