src: fix use of logging_vty_add_cmds() without log_info parameter

This patch fixes:

  CC     gb_proxy_main.o
gb_proxy_main.c: In function ‘main’:
gb_proxy_main.c:224: warning: implicit declaration of function ‘logging_vty_add_cmds’

And a similar problem in osmo-bsc_nat.

This was introduced in by myself in patch:
"bsc: change bsc_vty_init to take logging categories as parameter"

Signed-off-by: Pablo Neira Ayuso <pablo@gnumonks.org>
diff --git a/openbsc/src/gprs/sgsn_main.c b/openbsc/src/gprs/sgsn_main.c
index c59265f..53494c1 100644
--- a/openbsc/src/gprs/sgsn_main.c
+++ b/openbsc/src/gprs/sgsn_main.c
@@ -40,6 +40,7 @@
 #include <osmocore/process.h>
 
 #include <osmocom/vty/telnet_interface.h>
+#include <osmocom/vty/logging.h>
 
 #include <openbsc/signal.h>
 #include <openbsc/debug.h>
@@ -220,7 +221,7 @@
 
 	vty_info.copyright = openbsc_copyright;
 	vty_init(&vty_info);
-	logging_vty_add_cmds();
+	logging_vty_add_cmds(&log_info);
         sgsn_vty_init();
 
 	handle_options(argc, argv);