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/main.c b/main.c
index 784f7f2..422d707 100644
--- a/main.c
+++ b/main.c
@@ -66,7 +66,7 @@ int main(int argc, char *argv[])
 		tv.tv_sec = 0;
 		tv.tv_usec = 250000;
 		if (select(max, &fds, &wfds, NULL, &tv) <= 0) {
-			d.blink++;
+			d.blink ^= 1;
 			FD_ZERO(&fds);
 		}