[apparmor] constify struct path * in a bunch of helpers

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/security/apparmor/file.c b/security/apparmor/file.c
index 913f377..4dfc5d0 100644
--- a/security/apparmor/file.c
+++ b/security/apparmor/file.c
@@ -275,7 +275,7 @@
  *
  * Returns: %0 else error if access denied or other error
  */
-int aa_path_perm(int op, struct aa_profile *profile, struct path *path,
+int aa_path_perm(int op, struct aa_profile *profile, const struct path *path,
 		 int flags, u32 request, struct path_cond *cond)
 {
 	char *buffer = NULL;