Cannot delete comments that are attached to nodes

If when creating comments on heartbeat messages that create comments on the referenced nodes, you cannot then delete the comment via the heartbeat comment delete link.

The patch includes a very simple bug fix replacing line 905 in heartbeat_comments.module

return ($result->fetchField('uid') == $GLOBALS['user']->uid && user_access('delete own comments'));

with

return ($result->fetchField() == $GLOBALS['user']->uid && user_access('delete own comments'));