crypto: octeontx2 - fix missing unlock

Add the missing unlock before return from error path.

Fixes: 4363f3d3 ("crypto: octeontx2 - add synchronization between mailbox accesses")
Reported-by: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/marvell/octeontx2/otx2_cptpf_main.c

@@ -143,8 +143,10 @@ static void cptpf_flr_wq_handler(struct work_struct *work)
 	mutex_lock(&pf->lock);
 	req = otx2_mbox_alloc_msg_rsp(mbox, 0, sizeof(*req),
 				      sizeof(struct msg_rsp));
-	if (!req)
+	if (!req) {
+		mutex_unlock(&pf->lock);
 		return;
+	}
 
 	req->sig = OTX2_MBOX_REQ_SIG;
 	req->id = MBOX_MSG_VF_FLR;

drivers/crypto/marvell/octeontx2/otx2_cptpf_mbox.c

@@ -20,8 +20,10 @@ static int forward_to_af(struct otx2_cptpf_dev *cptpf,
 
 	mutex_lock(&cptpf->lock);
 	msg = otx2_mbox_alloc_msg(&cptpf->afpf_mbox, 0, size);
-	if (msg == NULL)
+	if (msg == NULL) {
+		mutex_unlock(&cptpf->lock);
 		return -ENOMEM;
+	}
 
 	memcpy((uint8_t *)msg + sizeof(struct mbox_msghdr),
 	       (uint8_t *)req + sizeof(struct mbox_msghdr), size);