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bar: leave last aux on screen on eof

This allows a static aux with:
echo 'a | b' | bar | ...

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

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

@@ -200,9 +200,9 @@

 	Binit(&b, 0, OREAD);

 	for(;;){

 		s = Brdstr(&b, '\n', 1);

-		sendp(c, s ? s : strdup(""));

 		if(s == nil)

 			break;

+		sendp(c, s);

 	}

 	Bterm(&b);