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rio: fix unused variable warning in wscroll()

--- a/sys/src/cmd/rio/scrl.c

+++ b/sys/src/cmd/rio/scrl.c

@@ -126,11 +126,10 @@

 {

 	uint p0, oldp0;

 	Rectangle s;

-	int x, y, my, h, first;

+	int y, my, h, first;

 	s = insetrect(w->scrollr, 1);

 	h = s.max.y-s.min.y;

-	x = (s.min.x+s.max.x)/2;

 	oldp0 = ~0;

 	first = TRUE;

 	do{

-- 

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