staging: olpc_dcon: fix sparse symbol not declared warning

This patch gets rid of the following sparse warning:

drivers/staging/olpc_dcon/olpc_dcon.c:787:19: warning: symbol 'dcon_driver' was not declared. Should it be static?

Signed-off-by: Murilo Opsfelder Araujo <mopsfelder@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/olpc_dcon/olpc_dcon.c b/drivers/staging/olpc_dcon/olpc_dcon.c
index 6a9a881..bc7e664 100644
--- a/drivers/staging/olpc_dcon/olpc_dcon.c
+++ b/drivers/staging/olpc_dcon/olpc_dcon.c
@@ -780,7 +780,7 @@
 };
 MODULE_DEVICE_TABLE(i2c, dcon_idtable);
 
-struct i2c_driver dcon_driver = {
+static struct i2c_driver dcon_driver = {
 	.driver = {
 		.name	= "olpc_dcon",
 		.pm = &dcon_pm_ops,