Fix dmu_recv_stream test for resumable

Use dsl_dataset_has_resume_receive_state()
not dsl_dataset_is_zapified() to check if
stream is resumable.

Reviewed-by: Matthew Ahrens <[email protected]>
Reviewed-by: Alek Pinchuk <[email protected]>
Reviewed-by: Ryan Moeller <[email protected]>
Signed-off-by: Paul Zuchowski <[email protected]>
Closes #12034

Author: PaulZ-98

module/zfs/dmu_recv.c

@@ -2880,8 +2880,8 @@ dmu_recv_stream(dmu_recv_cookie_t *drc, offset_t *voffp)
 	int err = 0;
 	struct receive_writer_arg *rwa = kmem_zalloc(sizeof (*rwa), KM_SLEEP);
 
-	if (dsl_dataset_is_zapified(drc->drc_ds)) {
-		uint64_t bytes;
+	if (dsl_dataset_has_resume_receive_state(drc->drc_ds)) {
+		uint64_t bytes = 0;
 		(void) zap_lookup(drc->drc_ds->ds_dir->dd_pool->dp_meta_objset,
 		    drc->drc_ds->ds_object, DS_FIELD_RESUME_BYTES,
 		    sizeof (bytes), 1, &bytes);