lapdm: Make sure that the msgb_l3len(msg) == length...
This code should not play with the internals of the msgb like this,
this code got introduced in af48bed55607931307 and is breaking the
osmo-bts usecase of forwarding an RSL message.
Add a test case that fails without the new code. I would prefer if
we could get rid of the manipulating the msgb like this, it is prone
to errors like this one.
diff --git a/tests/lapd/lapd_test.ok b/tests/lapd/lapd_test.ok
index 058ac3d..d67a0a8 100644
--- a/tests/lapd/lapd_test.ok
+++ b/tests/lapd/lapd_test.ok
@@ -9,8 +9,8 @@
MS: Verifying incoming primitive.
Sending back to MS
-ms_to_bts_tx_cb: BTS->MS(us) message 21
-MS: Verifying incoming MM message.
+ms_to_bts_tx_cb: BTS->MS(us) message 12
+MS: Verifying incoming MM message: 3
ms_to_bts_l1_cb: MS(us) -> BTS prim message
Sending back to BTS