staging: vt6656: sparse fixes: dpc.c missing dpc.h

sparse warnings
dpc.c:249:5: warning: symbol 'RXbBulkInProcessData' was not declared. Should it be static?
dpc.c:1295:6: warning: symbol 'RXvWorkItem' was not declared. Should it be static?
dpc.c:1321:6: warning: symbol 'RXvFreeRCB' was not declared. Should it be static?
dpc.c:1356:6: warning: symbol 'RXvMngWorkItem' was not declared. Should it be static?

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/vt6656/dpc.c b/drivers/staging/vt6656/dpc.c
index 7b050e9..eca04c0 100644
--- a/drivers/staging/vt6656/dpc.c
+++ b/drivers/staging/vt6656/dpc.c
@@ -38,6 +38,7 @@
  *
  */
 
+#include "dpc.h"
 #include "device.h"
 #include "rxtx.h"
 #include "tether.h"