The init_lock is not declared or used outside of cros_ec_ishtp.c
so make it static to avoid the following warning:
drivers/platform/chrome/cros_ec_ishtp.c:79:1: warning: symbol 'init_lock' was not declared. Should it be static?
Signed-off-by: Ben Dooks (Codethink) <ben.dooks@codethink.co.uk>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
  *
  * The writers are .reset() and .probe() function.
  */
-DECLARE_RWSEM(init_lock);
+static DECLARE_RWSEM(init_lock);
 
 /**
  * struct response_info - Encapsulate firmware response related