module.h: Annotate mod_kallsyms with __rcu

This patch fixes the following sparse errors:

kernel/module.c:3623:9: error: incompatible types in comparison expression
kernel/module.c:4060:41: error: incompatible types in comparison expression
kernel/module.c:4203:28: error: incompatible types in comparison expression
kernel/module.c:4225:41: error: incompatible types in comparison expression
Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
Signed-off-by: Jessica Yu <jeyu@kernel.org>

include/linux/module.h

@@ -429,7 +429,7 @@ struct module {
 
 #ifdef CONFIG_KALLSYMS
 	/* Protected by RCU and/or module_mutex: use rcu_dereference() */
-	struct mod_kallsyms *kallsyms;
+	struct mod_kallsyms __rcu *kallsyms;
 	struct mod_kallsyms core_kallsyms;
 
 	/* Section attributes */