dmu_redact.c does not call bqueue_destroy

Ensure all calls to bqueue_init() has a corresponding call to bqueue_destroy()

Reviewed-by: Paul Dagnelie <pcd@delphix.com>
Co-authored-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Jorgen Lundman <lundman@lundman.net>
Closes openzfs#12118

module/zfs/dmu_redact.c

@@ -816,6 +816,7 @@ perform_thread_merge(bqueue_t *q, uint32_t num_threads,
 		avl_remove(&end_tree, &redact_nodes[i]);
 		kmem_free(redact_nodes[i].record,
 		    sizeof (struct redact_record));
+		bqueue_destroy(&thread_args[i].q);
 	}
 
 	avl_destroy(&start_tree);
@@ -1164,6 +1165,7 @@ dmu_redact_snap(const char *snapname, nvlist_t *redactnvl,
 	(void) thread_create(NULL, 0, redact_merge_thread, rmta, 0, curproc,
 	    TS_RUN, minclsyspri);
 	err = perform_redaction(os, new_rl, rmta);
+	bqueue_destroy(&rmta->q);
 	kmem_free(rmta, sizeof (struct redact_merge_thread_arg));
 
 out: