[cosmetic] bankd: mark handle_options() as static

Change-Id: I991542d8fb52cc86e850bf5d20352c802f77c392
diff --git a/src/bankd/bankd_main.c b/src/bankd/bankd_main.c
index ecfa22d..a9c7b71 100644
--- a/src/bankd/bankd_main.c
+++ b/src/bankd/bankd_main.c
@@ -286,7 +286,7 @@
 static int g_bind_port = 9999;
 static char *g_bind_ip = NULL;
 
-void handle_options(int argc, char **argv)
+static void handle_options(int argc, char **argv)
 {
 	while (1) {
 		int option_index = 0, c;