Delay breaking out of the parse loop when max_tree_depth is hit

When a token causes a node to be added to the DOM which increases the
depth of the DOM to exceed the `max_tree_depth` _and_ the token needs to
be reprocessed, memory is leaked. By delaying breaking out of the loop
until after the token has been completely handled, this appears to fix
the leak.

Fixes #3098

gumbo-parser/src/parser.c

@@ -4826,14 +4826,17 @@ GumboOutput* gumbo_parse_with_options (
       // to a token.
       if (token.type == GUMBO_TOKEN_END_TAG &&
           token.v.end_tag.tag == GUMBO_TAG_UNKNOWN)
+      {
         gumbo_free(token.v.end_tag.name);
+        token.v.end_tag.name = NULL;
+      }
+      if (unlikely(state->_open_elements.length > max_tree_depth)) {
+        parser._output->status = GUMBO_STATUS_TREE_TOO_DEEP;
+        gumbo_debug("Tree depth limit exceeded.\n");
+        break;
+      }
     }
 
-    if (unlikely(state->_open_elements.length > max_tree_depth)) {
-      parser._output->status = GUMBO_STATUS_TREE_TOO_DEEP;
-      gumbo_debug("Tree depth limit exceeded.\n");
-      break;
-    }
 
     ++loop_count;
     assert(loop_count < 1000000000UL);