sizeof(long) doesn't always equal 4

in particular, it's 8 on my amd64. really, this loop intends to consume
4 bytes at a time, not sizeof(long), so use the constant 4.

1 files changed, 1 insertions, 1 deletions

diff --git a/packet.c b/packet.c
index a56fb55a..e811c4a6 100644
--- a/packet.c
+++ b/packet.c
@@ -1678,7 +1678,7 @@ void packet_parse(struct gps_packet_t *lexer)
 	    len = lexer->inbufptr - lexer->inbuffer;
 
 	    /* Calculate checksum */
-	    for (n = 0; n < len; n += sizeof(long)) {
+	    for (n = 0; n < len; n += 4) {
 		cs ^= getleul(lexer->inbuffer, n);
 	    }