can: make struct can_proto const

commit 53914b67993c724cec585863755c9ebc8446e83b had the
same message. That commit did put everything in place but
did not make can_proto const itself.

Signed-off-by: Kurt Van Dijck <kurt.van.dijck@eia.be>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/can/raw.c b/net/can/raw.c
index 0eb39a7..dea99a6 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -774,7 +774,7 @@
 	.init       = raw_init,
 };
 
-static struct can_proto raw_can_proto __read_mostly = {
+static const struct can_proto raw_can_proto = {
 	.type       = SOCK_RAW,
 	.protocol   = CAN_RAW,
 	.ops        = &raw_ops,