CRED: Make inode_has_perm() and file_has_perm() take a cred pointer

Make inode_has_perm() and file_has_perm() take a cred pointer rather than a
task pointer.

Signed-off-by: David Howells <[email protected]>
Acked-by: James Morris <[email protected]>
Acked-by: Serge Hallyn <[email protected]>
Signed-off-by: James Morris <[email protected]>

Author: dhowells