cfg80211: use __force __rcu to suppress sparse warning

The code assigns a constant value (a pointer to a static variable)
to an RCU pointer, which results in a sparse warning:
  reg.c:112:10: warning: cast adds address space to expression (<asn:4>)

Suppress this warning by using __force.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 47be616..d83480b6 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -109,7 +109,7 @@
  * protected by RTNL (and can be accessed with RCU protection)
  */
 static struct regulatory_request __rcu *last_request =
-	(void __rcu *)&core_request_world;
+	(void __force __rcu *)&core_request_world;
 
 /* To trigger userspace events */
 static struct platform_device *reg_pdev;