ksmbd: constify struct path

... in particular, there should never be a non-const pointers to
any file->f_path.

Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Steve French <stfrench@microsoft.com>
diff --git a/fs/ksmbd/misc.c b/fs/ksmbd/misc.c
index df99110..364a0a4 100644
--- a/fs/ksmbd/misc.c
+++ b/fs/ksmbd/misc.c
@@ -159,7 +159,7 @@ int parse_stream_name(char *filename, char **stream_name, int *s_type)
  */
 
 char *convert_to_nt_pathname(struct ksmbd_share_config *share,
-			     struct path *path)
+			     const struct path *path)
 {
 	char *pathname, *ab_pathname, *nt_pathname;
 	int share_path_len = share->path_sz;