modules: Fix up build when CONFIG_MODULE_UNLOAD=n.

Commit 3d43321b7015387cfebbe26436d0e9d299162ea1 ("modules: sysctl to
block module loading") introduces a modules_disabled variable that is
only defined if CONFIG_MODULE_UNLOAD is enabled, despite being used in
other places. This moves it up and fixes up the build.

  CC      kernel/module.o
kernel/module.c: In function 'sys_init_module':
kernel/module.c:2401: error: 'modules_disabled' undeclared (first use in this function)
kernel/module.c:2401: error: (Each undeclared identifier is reported only once
kernel/module.c:2401: error: for each function it appears in.)
make[1]: *** [kernel/module.o] Error 1
make: *** [kernel/module.o] Error 2

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: James Morris <jmorris@namei.org>

kernel/module.c

@@ -71,6 +71,9 @@
 static DEFINE_MUTEX(module_mutex);
 static LIST_HEAD(modules);
 
+/* Block module loading/unloading? */
+int modules_disabled = 0;
+
 /* Waiting for a module to finish initializing? */
 static DECLARE_WAIT_QUEUE_HEAD(module_wq);
 
@@ -778,9 +781,6 @@ static void wait_for_zero_refcount(struct module *mod)
 	mutex_lock(&module_mutex);
 }
 
-/* Block module loading/unloading? */
-int modules_disabled = 0;
-
 SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
 		unsigned int, flags)
 {