gbproxy: Correct the method name. We work on TLLIs

Done with Jacob
diff --git a/openbsc/src/gprs/gb_proxy_vty.c b/openbsc/src/gprs/gb_proxy_vty.c
index 16d8cee..2ca0c57 100644
--- a/openbsc/src/gprs/gb_proxy_vty.c
+++ b/openbsc/src/gprs/gb_proxy_vty.c
@@ -519,7 +519,7 @@
 	state = &peer->patch_state;
 
 	if (match == MATCH_STALE) {
-		found = gbprox_remove_stale_ttlis(peer, time(NULL));
+		found = gbprox_remove_stale_tllis(peer, time(NULL));
 		if (found)
 			vty_out(vty, "Deleted %d stale TLLI%s%s",
 				found, found == 1 ? "" : "s", VTY_NEWLINE);