[wp-trac] [WordPress Trac] #51558: Fix "Only variables should be passed by reference" notice

[WordPress Trac]

#51558: Fix "Only variables should be passed by reference" notice
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 Reporter:  jrf               |      Owner:  (none)
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  5.6
Component:  Feeds             |    Version:  trunk
 Severity:  minor             |   Keywords:  has-patch commit
  Focuses:  coding-standards  |
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 WP should not throw notices. But when `atomlib.php` is used, it would.
 See: https://3v4l.org/mCQ9d

 While this is an external dependency, it is no longer maintained
 externally, so fixing this in the version in Core only.

 There is no functional change.

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Ticket URL: <https://core.trac.wordpress.org/ticket/51558>
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