NFC: nci: Move NFCEE discovery logic

NFCEE_DISCOVER_CMD is a specified NCI command used to discover
NFCEE IDs.
Move nci_nfcee_discover() call to nci_discover_se() in order to
guarantee:
- NFCEE_DISCOVER_CMD run when the NCI state machine is initialized
- NFCEE_DISCOVER_CMD is not run in case there is not discover_se
hook defined by a NFC device driver.

Signed-off-by: Christophe Ricard <[e-mail]>
Signed-off-by: Samuel Ortiz <[e-mail]>

drivers/nfc/st21nfcb/st21nfcb_se.c

···
 	struct nci_conn_info    *conn_info;
 	int r, dev_num;
 
-	r = nci_nfcee_discover(ndev, NCI_NFCEE_DISCOVERY_ACTION_ENABLE);
-	if (r != NCI_STATUS_OK)
-		goto exit;
-
 	dest_params =
 		kzalloc(sizeof(struct core_conn_create_dest_spec_params) +
 			sizeof(struct dest_spec_params), GFP_KERNEL);

net/nfc/nci/core.c

···
 
 static int nci_discover_se(struct nfc_dev *nfc_dev)
 {
+	int r;
 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 
-	if (ndev->ops->discover_se)
+	if (ndev->ops->discover_se) {
+		r = nci_nfcee_discover(ndev, NCI_NFCEE_DISCOVERY_ACTION_ENABLE);
+		if (r != NCI_STATUS_OK)
+			return -EPROTO;
+
 		return ndev->ops->discover_se(ndev);
+	}
 
 	return 0;
 }