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lock: Fix some memory leaks (thanks steve simon!)

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

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

@@ -35,6 +35,7 @@

 		}

 		if (w->pid == pid)

 			return w;

+		free(w);

 	}

 }

@@ -141,7 +142,8 @@

 		error("wait");

 	postnote(PNPROC, lckpid, "die");

-	waitfor(lckpid);

+	free(waitfor(lckpid));

+

 	if(w->msg[0]){

 		p = utfrune(w->msg, ':');

 		if(p && p[1])