NFC: Fix sparse warnings due to missing static

Signed-off-by: Arron Wang <arron.wang@intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/nfc/pn544/pn544.c

@@ -714,8 +714,8 @@ static int pn544_hci_check_presence(struct nfc_hci_dev *hdev,
 	return 0;
 }
 
-void pn544_hci_event_received(struct nfc_hci_dev *hdev, u8 gate, u8 event,
-				struct sk_buff *skb)
+static void pn544_hci_event_received(struct nfc_hci_dev *hdev, u8 gate,
+					u8 event, struct sk_buff *skb)
 {
 	struct sk_buff *rgb_skb = NULL;
 	int r = 0;

net/nfc/hci/core.c

@@ -650,7 +650,7 @@ static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
 	return r;
 }
 
-int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
+static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
 {
 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);