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acme: fix fd checks - initialize Window.rdselfd to -1 not 0

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

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

@@ -84,6 +84,7 @@

 	}

 	if(w == nil){

 		w = emalloc(sizeof(Window));

+		w->rdselfd = -1;

 		w->col = c;

 		draw(screen, r, textcols[BACK], nil, ZP);

 		wininit(w, clone, r);

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

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

@@ -236,7 +236,7 @@

 			break;

 		case QWrdsel:

 			close(w->rdselfd);

-			w->rdselfd = 0;

+			w->rdselfd = -1;

 			break;

 		case QWwrsel:

 			w->nomark = FALSE;