subsys/fs: hide non-public API

fs_get_mnt_point is not prototyped and should not be public.

Signed-off-by: Peter A. Bigot <pab@pabigot.com>
diff --git a/subsys/fs/fs.c b/subsys/fs/fs.c
index 03c4c09..92f9ea0 100644
--- a/subsys/fs/fs.c
+++ b/subsys/fs/fs.c
@@ -25,8 +25,8 @@
 /* file system map table */
 static struct fs_file_system_t *fs_map[FS_TYPE_END];
 
-int fs_get_mnt_point(struct fs_mount_t **mnt_pntp,
-		     const char *name, size_t *match_len)
+static int fs_get_mnt_point(struct fs_mount_t **mnt_pntp,
+			    const char *name, size_t *match_len)
 {
 	struct fs_mount_t *mnt_p = NULL, *itr;
 	size_t longest_match = 0;