Remove unused enum FS_NULL.

backend/mustek_usb2_asic.h

@@ -69,7 +69,6 @@
 
 typedef enum
 {
-  FS_NULL = 0,
   FS_ATTACHED = 1,
   FS_OPENED = 2,
   FS_SCANNING = 3

backend/mustek_usb2_high.c

@@ -142,7 +142,7 @@ MustScanner_Init (void)
 {
   DBG (DBG_FUNC, "MustScanner_Init: Call in\n");
 
-  g_chip.firmwarestate = FS_NULL;
+  g_chip.firmwarestate = FS_ATTACHED;
   if (STATUS_GOOD != Asic_Open (&g_chip))
     {
       DBG (DBG_FUNC, "MustScanner_Init: Asic_Open return error\n");