NFC: st95hf: remove set but not used variables 'dev, nfcddev'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/nfc/st95hf/core.c: In function 'st95hf_irq_thread_handler':
drivers/nfc/st95hf/core.c:786:26: warning:
 variable 'nfcddev' set but not used [-Wunused-but-set-variable]

drivers/nfc/st95hf/core.c:784:17: warning:
 variable 'dev' set but not used [-Wunused-but-set-variable]

They are never used since introduction in
commit cab47333 ("NFC: Add STMicroelectronics ST95HF driver")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/nfc/st95hf/core.c

@@ -781,9 +781,7 @@ static irqreturn_t st95hf_irq_thread_handler(int irq, void  *st95hfcontext)
 	int result = 0;
 	int res_len;
 	static bool wtx;
-	struct device *dev;
 	struct device *spidevice;
-	struct nfc_digital_dev *nfcddev;
 	struct sk_buff *skb_resp;
 	struct st95hf_context *stcontext  =
 		(struct st95hf_context *)st95hfcontext;
@@ -828,8 +826,6 @@ static irqreturn_t st95hf_irq_thread_handler(int irq, void  *st95hfcontext)
 		goto end;
 	}
 
-	dev = &stcontext->nfcdev->dev;
-	nfcddev = stcontext->ddev;
 	if (skb_resp->data[2] == WTX_REQ_FROM_TAG) {
 		/* Request for new FWT from tag */
 		result = st95hf_handle_wtx(stcontext, true, skb_resp->data[3]);