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Update powertagging.module

Maarten Segers requested to merge issue/powertagging-2971317:2971317-strict-warning-repeated into 7.x-2.x

Fix Only variables should be passed by reference

Render expects a variable passed by reference, see https://api.drupal.org/api/drupal/includes%21common.inc/function/render/7.x

Closes #2971317

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