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acme: fix plumb message leaks (thanks igor)

--- a/sys/src/cmd/acme/exec.c

+++ b/sys/src/cmd/acme/exec.c

@@ -352,8 +352,7 @@

 			pm->ndata = strlen(pm->data);

 			if(pm->ndata < messagesize-1024)

 				plumbsend(plumbsendfd, pm);

-			else

-				plumbfree(pm);

+			plumbfree(pm);

 		}

 		colclose(et->col, et->w, TRUE);

 	}

@@ -687,8 +686,7 @@

 		pm->ndata = strlen(pm->data);

 		if(pm->ndata < messagesize-1024)

 			plumbsend(plumbsendfd, pm);

-		else

-			plumbfree(pm);

+		plumbfree(pm);

 	}

 	fbuffree(s);

 	fbuffree(r);