vty: remove ignored logging parameters

Since ce9fec3e896571835ac5bfd2980d6836f2b29f0d libosmocore ignores
parameters to log_vty_command_* functions. Hence parameter of
logging_vty_add_cmds() is ignored too. As we depend on much later
libosmocore version anyway, we can simplify code somewhat by removing
parameters which will be ignored anyway.

Change-Id: I62f752fd88f1d8fefa563648f9864c7c31f87991
diff --git a/openbsc/src/libbsc/bsc_vty.c b/openbsc/src/libbsc/bsc_vty.c
index 7d3b4af..00acbc7 100644
--- a/openbsc/src/libbsc/bsc_vty.c
+++ b/openbsc/src/libbsc/bsc_vty.c
@@ -3851,7 +3851,7 @@
 
 extern int bsc_vty_init_extra(void);
 
-int bsc_vty_init(const struct log_info *cat, struct gsm_network *network)
+int bsc_vty_init(struct gsm_network *network)
 {
 	cfg_ts_pchan_cmd.string =
 		vty_cmd_string_from_valstr(tall_bsc_ctx,
@@ -3887,7 +3887,7 @@
 	install_element_ve(&show_paging_cmd);
 	install_element_ve(&show_paging_group_cmd);
 
-	logging_vty_add_cmds(cat);
+	logging_vty_add_cmds(NULL);
 	osmo_stats_vty_add_cmds();
 
 	install_element(GSMNET_NODE, &cfg_net_neci_cmd);