Issue #3173873 by shetpooja04: Unused variable $pos in SearchQuery.php, search module

(cherry picked from commit e0c3bb56)

core/modules/search/src/SearchQuery.php

@@ -520,7 +520,7 @@ public function addScore($score, $arguments = [], $multiply = FALSE) {
     // search expression. So, use string replacement to change this to a
     // calculated query expression, counting the number of occurrences so
     // in the execute() method we can add arguments.
-    while (($pos = strpos($score, 'i.relevance')) !== FALSE) {
+    while (strpos($score, 'i.relevance') !== FALSE) {
       $pieces = explode('i.relevance', $score, 2);
       $score = implode('((ROUND(:normalization_' . $this->relevance_count . ', 4)) * i.score * t.count)', $pieces);
       $this->relevance_count++;