6lowpan: udp use subtraction on both conditions

Cleanup code to handle both calculation in the same way.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/net/ieee802154/6lowpan_iphc.c b/net/ieee802154/6lowpan_iphc.c
index 8857285b418b3eea65177a9aaeaaa357ea4efdbe..b298bfc1494324ff34edbdd72a31509f7e34b9e1 100644 (file)
--- a/net/ieee802154/6lowpan_iphc.c
+++ b/net/ieee802154/6lowpan_iphc.c
@@ -557,7 +557,7 @@ static void compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb)
                lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp));
                tmp = /* subtraction is faster */
                   (u8)((ntohs(uh->dest) - LOWPAN_NHC_UDP_4BIT_PORT) +
-                      ((ntohs(uh->source) & LOWPAN_NHC_UDP_4BIT_PORT) << 4));
+                      ((ntohs(uh->source) - LOWPAN_NHC_UDP_4BIT_PORT) << 4));
                lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp));
        } else if ((ntohs(uh->dest) & LOWPAN_NHC_UDP_8BIT_MASK) ==
                        LOWPAN_NHC_UDP_8BIT_PORT) {