afs: Fix a use after free in afs_xattr_get_acl()
The "op" pointer is freed earlier when we call afs_put_operation(). Fixes: e49c7b2f ("afs: Build an abstraction around an "operation" concept") Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com> Signed-off-by: NDavid Howells <dhowells@redhat.com> cc: Colin Ian King <colin.king@canonical.com>
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