parse-options.c: make check_typos() static

This function is not used by any other file.

Signed-off-by: Nanako Shiraishi <nanako3@lavabit.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

parse-options.c

@@ -214,7 +214,7 @@ is_abbreviated:
 	return -2;
 }
 
-void check_typos(const char *arg, const struct option *options)
+static void check_typos(const char *arg, const struct option *options)
 {
 	if (strlen(arg) < 3)
 		return;