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camv: fix leak on resize

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

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

@@ -39,8 +39,9 @@

 void

 screeninit(void)

 {

-	bg = allocimage(display, Rect(0, 0, 1, 1), screen->chan, 1, 0xCCCCCCFF);

+	freescreen(scr);

 	scr = allocscreen(screen, bg, 0);

+	freeimage(disp);

 	disp = allocwindow(scr, screen->r, 0, 0xCCCCCCFF);

 	draw(screen, screen->r, bg, nil, ZP);

 	flushimage(display, 1);

@@ -225,6 +226,7 @@

 	if(initdraw(nil, nil, "camv") < 0)

 		sysfatal("initdraw: %r");

+	bg = allocimage(display, Rect(0, 0, 1, 1), screen->chan, 1, 0xCCCCCCFF);

 	screeninit();

 	kc = initkeyboard(nil);

 	if(kc == nil) sysfatal("initkeyboard: %r");

-- 

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