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htmlroff: fix tcs pipe leak

--- a/sys/src/cmd/htmlroff/char.c

+++ b/sys/src/cmd/htmlroff/char.c

@@ -33,14 +33,15 @@

 			sysfatal("fork: %r");

 		case 0:

 			dup(p[0], 0);

-			dup(p[1], 1);

+			dup(p[0], 1);

 			close(p[0]);

 			close(p[1]);

 			execl("/bin/tcs", "tcs", "-t", "html", nil);

 			_exits(0);

 		default:

+			close(p[0]);

 			fd = p[1];

-			Binit(&b, p[0], OREAD);

+			Binit(&b, fd, OREAD);

 			break;

 		}

 	}

-- 

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