devvga: fix mistake

diff --git a/sys/src/9/pc/devvga.c b/sys/src/9/pc/devvga.c
index 7bf3937a5185a910d25d30ad99a5aaaa0c03c144..d5e9868d7258bd2c98be7d58717a00ba81e4fa34 100644 (file)
--- a/sys/src/9/pc/devvga.c
+++ b/sys/src/9/pc/devvga.c
@@ -205,7 +205,8 @@ vgaread(Chan* c, void* a, long n, vlong off)
                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);