staging: dgnc: Do not initialise statics to 0 or NULL

This fixes the following checkpatch.pl error:
ERROR: do not initialise statics to 0 or NULL
Signed-off-by: Roberta Dobrescu <roberta.dobrescu@gmail.com>
Acked-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dgnc/dgnc_tty.c

@@ -67,7 +67,7 @@
  * internal variables
  */
 static struct dgnc_board	*dgnc_BoardsByMajor[256];
-static uchar		*dgnc_TmpWriteBuf = NULL;
+static uchar		*dgnc_TmpWriteBuf;
 static DECLARE_MUTEX(dgnc_TmpWriteSem);
 
 /*