sysctl: remove an unused variable

"links" is never used, so we can remove it.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NEric W. Biederman <ebiederm@xmission.com>

fs/proc/proc_sysctl.c

@@ -1165,7 +1165,6 @@ struct ctl_table_header *__register_sysctl_table(
 	const char *path, struct ctl_table *table)
 {
 	struct ctl_table_root *root = set->dir.header.root;
-	struct ctl_table_header *links = NULL;
 	struct ctl_table_header *header;
 	const char *name, *nextname;
 	struct ctl_dir *dir;
@@ -1222,7 +1221,6 @@ struct ctl_table_header *__register_sysctl_table(
 	drop_sysctl_table(&dir->header);
 	spin_unlock(&sysctl_lock);
 fail:
-	kfree(links);
 	kfree(header);
 	dump_stack();
 	return NULL;