LAPDM: Use correct offset to short header on recevied frame
The offset of the short header on main DCCH is 0, not 2.
Change-Id: I8345776768fdf2a700b2ca1d117f9ef4b15777cc
diff --git a/src/gsm/lapdm.c b/src/gsm/lapdm.c
index 9f795c6..86dc242 100644
--- a/src/gsm/lapdm.c
+++ b/src/gsm/lapdm.c
@@ -754,7 +754,7 @@
msg->l2h += 2;
} else {
/* A Short L3 header has both bits == 0. */
- if (LAPDm_ADDR_SHORT_L2(msg->l2h[2]) == 0) {
+ if (LAPDm_ADDR_SHORT_L2(msg->l2h[0]) == 0) {
mctx.lapdm_fmt = LAPDm_FMT_Bter;
n201 = N201_Bter_SDCCH;
sapi = 0;