crypto: ccree - replace memset+kfree with kzfree

Replace memset to 0 followed by kfree with kzfree for
simplicity.

Signed-off-by: Gilad Ben-Yossef <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/crypto/ccree/cc_request_mgr.c

···
 	/* Kill tasklet */
 	tasklet_kill(&req_mgr_h->comptask);
 #endif
-	memset(req_mgr_h, 0, sizeof(struct cc_req_mgr_handle));
-	kfree(req_mgr_h);
+	kzfree(req_mgr_h);
 	drvdata->request_mgr_handle = NULL;
 }