staging: dgnc: Add const qualifier to struct declaration.

Const qualifier added to struct declaration to avoid data overwrite
during runtime and improve security.
Signed-off-by: Elise Lennion <elise.lennion@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dgnc/dgnc_driver.c

@@ -93,7 +93,7 @@ struct board_id {
 	unsigned int is_pci_express;
 };
 
-static struct board_id dgnc_ids[] = {
+static const struct board_id dgnc_ids[] = {
 	{	PCI_DEVICE_CLASSIC_4_PCI_NAME,		4,	0	},
 	{	PCI_DEVICE_CLASSIC_4_422_PCI_NAME,	4,	0	},
 	{	PCI_DEVICE_CLASSIC_8_PCI_NAME,		8,	0	},

drivers/staging/dgnc/dgnc_tty.c

@@ -50,7 +50,7 @@ static unsigned char		*dgnc_TmpWriteBuf;
 /*
  * Default transparent print information.
  */
-static struct digi_t dgnc_digi_init = {
+static const struct digi_t dgnc_digi_init = {
 	.digi_flags =	DIGI_COOK,	/* Flags			*/
 	.digi_maxcps =	100,		/* Max CPS			*/
 	.digi_maxchar =	50,		/* Max chars in print queue	*/