ipw2x00: use to_pci_dev()

Use to_pci_dev() instead of open-coding it.
Signed-off-by: NGeliang Tang <geliangtang@163.com>
Signed-off-by: NJulian Calaby <julian.calaby@gmail.com>
Acked-by: NStanislav Yakovlev <stas.yakovlev@gmail.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/intel/ipw2x00/ipw2100.c

@@ -3521,7 +3521,7 @@ static void ipw2100_msg_free(struct ipw2100_priv *priv)
 static ssize_t show_pci(struct device *d, struct device_attribute *attr,
 			char *buf)
 {
-	struct pci_dev *pci_dev = container_of(d, struct pci_dev, dev);
+	struct pci_dev *pci_dev = to_pci_dev(d);
 	char *out = buf;
 	int i, j;
 	u32 val;