coccinelle: api: rename kzfree to kfree_sensitive

Commit 453431a5

 ("mm, treewide: rename kzfree() to
kfree_sensitive()") renamed kzfree() to kfree_sensitive(),
it should be applied to coccinelle.

Signed-off-by: Weizhao Ouyang <o451686892@gmail.com>
Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
Acked-by: Denis Efremov <efremov@linux.com>