Set zv->zv_objset for zil_replay() case

For the case where we have a zil to replay we need to ensure that
zv->zv_objset contains the current objset.  Since the caller has
a hold on the object set it is safe to pass to zil_replay as part
of the zv.  Call path zvol_create_minor()->zil_replay()->
zil_parse()->zil_replay_log_record()->zvol_replay_write().

module/zfs/zvol.c

@@ -1118,6 +1118,7 @@ __zvol_create_minor(const char *name)
 		zv->zv_flags |= ZVOL_RDONLY;
 
 	zv->zv_volblocksize = doi->doi_data_block_size;
+	zv->zv_objset = os;
 
 	if (zil_replay_disable)
 		zil_destroy(dmu_objset_zil(os), B_FALSE);
@@ -1130,6 +1131,7 @@ __zvol_create_minor(const char *name)
 
 out_dmu_objset_disown:
 	dmu_objset_disown(os, zvol_tag);
+	zv->zv_objset = NULL;
 out_doi:
 	kmem_free(doi, sizeof(dmu_object_info_t));
 out: