--- a/usr/src/uts/common/fs/zfs/zvol.c	Wed Sep 30 12:12:33 2009 -0400
+++ b/usr/src/uts/common/fs/zfs/zvol.c	Wed Sep 30 11:27:15 2009 -0600
@@ -1771,7 +1771,7 @@
 		dmu_tx_abort(tx);
 		return (error);
 	}
-	dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx);
+	(void) dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx);
 	dmu_tx_commit(tx);
 
 	return (0);