use xor instead of incrementing blink

Because blink is a signed integer, an eventual overflow would result in
undefined behavior.

1 files changed, 1 insertions, 1 deletions

diff --git a/dblbuf.c b/dblbuf.c
index f6cbd88..afa180c 100644
--- a/dblbuf.c
+++ b/dblbuf.c
@@ -176,7 +176,7 @@ void uudisp_refresh(struct uudisp *d, struct uuterm *t)
 		blit_slice(d, idx, x1, x2);
 	}
 
-	if (d->blink & 1) {
+	if (d->blink) {
 		unsigned long rev = expand_color(d, 15);
 		int idx = t->rows[t->y]->idx;
 		b->slices[idx].colors[2*t->x] ^= rev;