make selinux_write_opts() static

This patch makes the needlessly global selinux_write_opts() static.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: James Morris <jmorris@namei.org>

security/selinux/hooks.c

@@ -957,7 +957,8 @@ static int superblock_doinit(struct super_block *sb, void *data)
 	return rc;
 }
 
-void selinux_write_opts(struct seq_file *m, struct security_mnt_opts *opts)
+static void selinux_write_opts(struct seq_file *m,
+			       struct security_mnt_opts *opts)
 {
 	int i;
 	char *prefix;