Add define for unset Frame Number
It's handy for OsmoPCU as well as upcoming LAPD T200 code.
Related: OS#4074
Change-Id: I641f1a1bf1e86ced8ffe89e88bc48afb79823393
diff --git a/include/osmocom/gsm/gsm_utils.h b/include/osmocom/gsm/gsm_utils.h
index fef2fdd..8e346c7 100644
--- a/include/osmocom/gsm/gsm_utils.h
+++ b/include/osmocom/gsm/gsm_utils.h
@@ -33,6 +33,7 @@
} while (0)
#define GSM_MAX_FN (26*51*2048)
+#define GSM_FN_UNSET 0xFFFFFFFF
/* Max length of random identifier which can be requested via osmo_get_rand_id() */
#define OSMO_MAX_RAND_ID_LEN 16