mark lchan2chan_nr() using a 'const' parameter
which fixes some compile warnings at some callers.
diff --git a/openbsc/include/openbsc/abis_rsl.h b/openbsc/include/openbsc/abis_rsl.h
index a911be3..b76d0fa 100644
--- a/openbsc/include/openbsc/abis_rsl.h
+++ b/openbsc/include/openbsc/abis_rsl.h
@@ -547,7 +547,7 @@
int n_pag_blocks);
unsigned int n_pag_blocks(int bs_ccch_sdcch_comb, unsigned int bs_ag_blks_res);
u_int64_t str_to_imsi(const char *imsi_str);
-u_int8_t lchan2chan_nr(struct gsm_lchan *lchan);
+u_int8_t lchan2chan_nr(const struct gsm_lchan *lchan);
int rsl_release_request(struct gsm_lchan *lchan, u_int8_t link_id);
/* to be provided by external code */
diff --git a/openbsc/src/abis_rsl.c b/openbsc/src/abis_rsl.c
index 8a4ed9b..d5c883e 100644
--- a/openbsc/src/abis_rsl.c
+++ b/openbsc/src/abis_rsl.c
@@ -241,7 +241,7 @@
}
/* See Table 10.5.25 of GSM04.08 */
-u_int8_t lchan2chan_nr(struct gsm_lchan *lchan)
+u_int8_t lchan2chan_nr(const struct gsm_lchan *lchan)
{
struct gsm_bts_trx_ts *ts = lchan->ts;
u_int8_t cbits, chan_nr;