USB: whci-hcd: fix compiler warning

Annotate whci_hcd_id_table as '__used' to fix following warning:

CC drivers/usb/host/whci/hcd.o
drivers/usb/host/whci/hcd.c:359: warning: ‘whci_hcd_id_table’ defined but not used

Signed-off-by: Namhyung Kim <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/host/whci/hcd.c

···
 module_exit(whci_hc_driver_exit);
 
 /* PCI device ID's that we handle (so it gets loaded) */
-static struct pci_device_id whci_hcd_id_table[] = {
+static struct pci_device_id __used whci_hcd_id_table[] = {
 	{ PCI_DEVICE_CLASS(PCI_CLASS_WIRELESS_WHCI, ~0) },
 	{ /* empty last entry */ }
 };