[6.0] 3a27bc8e8 polish

[Dridi Boukelmoune]

commit 3a27bc8e84841f9d657051f05485fd9bb006378d
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Thu May 3 13:40:56 2018 +0200

    polish

diff --git a/lib/libvmod_directors/vmod_shard.c b/lib/libvmod_directors/vmod_shard.c
index 77315f5b5..a50ff2f4b 100644
--- a/lib/libvmod_directors/vmod_shard.c
+++ b/lib/libvmod_directors/vmod_shard.c
@@ -806,8 +806,7 @@ shard_param_task(VRT_CTX, const void *id,
 	}
 
 	if (task->priv) {
-		p = task->priv;
-		CHECK_OBJ_NOTNULL(p, VMOD_SHARD_SHARD_PARAM_MAGIC);
+		CAST_OBJ_NOTNULL(p, task->priv, VMOD_SHARD_SHARD_PARAM_MAGIC);
 		assert(p->scope == SCOPE_TASK);
 		/* XXX
 		VSL(SLT_Debug, 0,