USB: storage: Use USB_ prefix instead of US_ prefix

This commit changes prefix for some of the USB mass storage
class related macros (ie. USB_SC_ for subclass and USB_PR_
for class).

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/storage/sddr09.c b/drivers/usb/storage/sddr09.c
index ab5f9f3..bcb9a70 100644
--- a/drivers/usb/storage/sddr09.c
+++ b/drivers/usb/storage/sddr09.c
@@ -1760,7 +1760,7 @@
 	if (result)
 		return result;
 
-	if (us->protocol == US_PR_DPCM_USB) {
+	if (us->protocol == USB_PR_DPCM_USB) {
 		us->transport_name = "Control/Bulk-EUSB/SDDR09";
 		us->transport = dpcm_transport;
 		us->transport_reset = usb_stor_CB_reset;