crypto: ccree - remove redundant 'flush_workqueue()' calls

'destroy_workqueue()' already drains the queue before destroying it, so
there is no need to flush it explicitly.

Remove the redundant 'flush_workqueue()' calls.

This was generated with coccinelle:

@@
expression E;
@@
- 	flush_workqueue(E);
	destroy_workqueue(E);
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Cristian Marussi <cristian.marussi@arm.com>
Acked-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/ccree/cc_request_mgr.c

@@ -101,7 +101,6 @@ void cc_req_mgr_fini(struct cc_drvdata *drvdata)
 	dev_dbg(dev, "max_used_sw_slots=%d\n", req_mgr_h->max_used_sw_slots);
 
 #ifdef COMP_IN_WQ
-	flush_workqueue(req_mgr_h->workq);
 	destroy_workqueue(req_mgr_h->workq);
 #else
 	/* Kill tasklet */