md-cluster: Fix a memleak in an error handling path

We know that 'bm_lockres' is NULL here, so 'lockres_free(bm_lockres)' is a
no-op. According to resource handling in case of error a few lines below,
it is likely that 'bitmap_free(bitmap)' was expected instead.

Fixes: b98938d16a10 ("md-cluster: introduce cluster_check_sync_size")

Signed-off-by: Christophe JAILLET <[e-mail]>
Reviewed-by: Guoqing Jiang <[e-mail]>
Signed-off-by: Shaohua Li <[e-mail]>

drivers/md/md-cluster.c

···
 		bm_lockres = lockres_init(mddev, str, NULL, 1);
 		if (!bm_lockres) {
 			pr_err("md-cluster: Cannot initialize %s\n", str);
-			lockres_free(bm_lockres);
+			bitmap_free(bitmap);
 			return -1;
 		}
 		bm_lockres->flags |= DLM_LKF_NOQUEUE;