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devvga: fix mistake

--- a/sys/src/9/pc/devvga.c

+++ b/sys/src/9/pc/devvga.c

@@ -205,7 +205,8 @@

 		p = seprint(p, e, "addr p %#p v %#p size %#ux\n",

 			scr->paddr, scr->vaddr, scr->apsize);

 		p = seprint(p, e, "softscreen %s\n", scr->softscreen ? "on" : "off");

-		n = readstr(offset, a, p - s, s);

+		USED(p);

+		n = readstr(offset, a, n, s);

 		poperror();

 		free(s);