V4L/DVB (13898): gspca - some subdrivers: Make sd_desc const.

The function callbacks in sd_desc are defined at compile time and
they do not change at runtime. Make the sd_desc initializations const.

Signed-off-by: Márton Németh <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/spca500.c b/drivers/media/video/gspca/spca500.c
index fe46868..7cc302a 100644
--- a/drivers/media/video/gspca/spca500.c
+++ b/drivers/media/video/gspca/spca500.c
@@ -1047,7 +1047,7 @@
 }
 
 /* sub-driver description */
-static struct sd_desc sd_desc = {
+static const struct sd_desc sd_desc = {
 	.name = MODULE_NAME,
 	.ctrls = sd_ctrls,
 	.nctrls = ARRAY_SIZE(sd_ctrls),