NFC: microread: drop unused variable

In microread_i2c_irq_thread_fn 'client' set but not used

Cc: Lauro Ramos Venancio <[e-mail]>
Cc: Aloisio Almeida Jr <[e-mail]>
Signed-off-by: Tomas Winkler <[e-mail]>
Signed-off-by: Samuel Ortiz <[e-mail]>

drivers/nfc/microread/i2c.c

···
 static irqreturn_t microread_i2c_irq_thread_fn(int irq, void *phy_id)
 {
 	struct microread_i2c_phy *phy = phy_id;
-	struct i2c_client *client;
 	struct sk_buff *skb = NULL;
 	int r;
 
···
 		WARN_ON_ONCE(1);
 		return IRQ_NONE;
 	}
-
-	client = phy->i2c_dev;
 
 	if (phy->hard_fault != 0)
 		return IRQ_HANDLED;