fs: make quota/netlink.c explicitly non-modular

The Kconfig currently controlling compilation of this code is:

config QUOTA_NETLINK_INTERFACE
        bool "Report quota messages through netlink interface"

...meaning that it currently is not being built as a module by anyone.

Lets remove the couple traces of modularity so that when reading the
driver there is no doubt it is builtin-only.

Since module_init translates to device_initcall in the non-modular
case, the init ordering gets bumped to one level earlier when we
use the more appropriate fs_initcall here.  However we've made similar
changes before without any fallout and none is expected here either.

Cc: Jan Kara <jack@suse.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Jan Kara <jack@suse.cz>

fs/quota/netlink.c

-
 #include <linux/cred.h>
 #include <linux/init.h>
-#include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/quotaops.h>
 #include <linux/sched.h>
@@ -105,5 +103,4 @@ static int __init quota_init(void)
 		       "VFS: Failed to create quota netlink interface.\n");
 	return 0;
 };
-
-module_init(quota_init);
+fs_initcall(quota_init);