A few "You applied for this job" on the top of a node

I 've found that user see a few messages (equal number of jobs applying) on the top of a page.

This message is generated in job.module, string #103

101 if (_job_check($node->nid, $user->uid)) {
102 // User has applied for this job
103 drupal_set_message(t('You applied for this job'));
104 return $links;

Why this "drupal_set_message" is in the link hook?

Some trick to change this in my opinion:

101 if (_job_check($node->nid, $user->uid)) {
102 // User has applied for this job
103 $links['job_apply'] = array(
104 'title' => t('You applied for this job'),
105 );
106 return $links;