V4L/DVB (13899): gspca - all subdrivers: Make control descriptors constant.

The ctrls field of struct sd_desc is declared as const
in gspca.h. It is worth to initialize the content also with
constant values.

Signed-off-by: Marton Nemeth <nm127@freemail.hu>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/gspca/spca508.c b/drivers/media/video/gspca/spca508.c
index 4d8e6cf..15b2eef 100644
--- a/drivers/media/video/gspca/spca508.c
+++ b/drivers/media/video/gspca/spca508.c
@@ -45,7 +45,7 @@
 static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val);
 static int sd_getbrightness(struct gspca_dev *gspca_dev, __s32 *val);
 
-static struct ctrl sd_ctrls[] = {
+static const struct ctrl sd_ctrls[] = {
 	{
 	    {
 		.id      = V4L2_CID_BRIGHTNESS,