[PATCH] USB: silence dpcm warning

Warnings aren't terribly important in and of themselves, but there
isn't really much the warning tells us to do here, so it would appear
that caving in to the compiler is the thing to do for now.

drivers/usb/storage/dpcm.c

@@ -56,7 +56,8 @@ int dpcm_transport(Scsi_Cmnd *srb, struct us_data *us)
     /*
      * LUN 0 corresponds to the CompactFlash card reader.
      */
-    return usb_stor_CB_transport(srb, us);
+    ret = usb_stor_CB_transport(srb, us);
+    break;
 
 #ifdef CONFIG_USB_STORAGE_SDDR09
   case 1:
@@ -71,12 +72,14 @@ int dpcm_transport(Scsi_Cmnd *srb, struct us_data *us)
     srb->device->lun = 0; us->srb->device->lun = 0;
     ret = sddr09_transport(srb, us);
     srb->device->lun = 1; us->srb->device->lun = 1;
+    break;
 
-    return ret;
 #endif
 
   default:
     US_DEBUGP("dpcm_transport: Invalid LUN %d\n", srb->device->lun);
-    return USB_STOR_TRANSPORT_ERROR;
+    ret = USB_STOR_TRANSPORT_ERROR;
+    break;
   }
+  return ret;
 }