Define is_listed() as static and add its prototype.

libmisc/console.c

@@ -34,13 +34,15 @@
 
 #ident "$Id$"
 
+/* local function prototypes */
+static int is_listed (const char *cfgin, const char *tty, int def);
 
 /*
  * This is now rather generic function which decides if "tty" is listed
  * under "cfgin" in config (directly or indirectly). Fallback to default if
  * something is bad.
  */
-int is_listed (const char *cfgin, const char *tty, int def)
+static int is_listed (const char *cfgin, const char *tty, int def)
 {
 	FILE *fp;
 	char buf[200], *cons, *s;