YIN parser BUGFIX store parsed keyword id in extension substatements

TODO substatements still are not correctly parsed since their arguments
are stored as attribute substatements instead of getting them (for the
known statements) and storing them as the statement's argument value.
diff --git a/tests/src/test_parser_yin.c b/tests/src/test_parser_yin.c
index 1d00e4d..865b064 100644
--- a/tests/src/test_parser_yin.c
+++ b/tests/src/test_parser_yin.c
@@ -373,7 +373,7 @@
 
     const char *data = "<elem attr=\"value\">text_value</elem>";
     lyxml_get_element(&st->yin_ctx->xml_ctx, &data, &prefix, &prefix_len, &name, &name_len);
-    ret = yin_parse_element_generic(st->yin_ctx, name, name_len, &data, &exts.child);
+    ret = yin_parse_element_generic(st->yin_ctx, name, name_len, prefix, prefix_len, &data, &exts.child);
     assert_int_equal(ret, LY_SUCCESS);
     assert_int_equal(st->yin_ctx->xml_ctx.status, LYXML_END);
     assert_string_equal(exts.child->stmt, "elem");
@@ -386,7 +386,7 @@
 
     data = "<elem></elem>";
     lyxml_get_element(&st->yin_ctx->xml_ctx, &data, &prefix, &prefix_len, &name, &name_len);
-    ret = yin_parse_element_generic(st->yin_ctx, name, name_len, &data, &exts.child);
+    ret = yin_parse_element_generic(st->yin_ctx, name, name_len, prefix, prefix_len, &data, &exts.child);
     assert_int_equal(ret, LY_SUCCESS);
     assert_string_equal(exts.child->stmt, "elem");
     assert_null(exts.child->child);