Fix warnings found by the headersclean test

qhelpsearchengine.h:71:9: error: declaration of 'wordList' shadows a member of 'this' [-Werror=shadow]

Change-Id: I3d0d6216276c9c06091d0f726c8513cc52da1885
Reviewed-by: Karsten Heimrich <karsten.heimrich@digia.com>

src/assistant/help/qhelpsearchengine.h

@@ -67,8 +67,8 @@ public:
 
     QHelpSearchQuery()
         : fieldName(DEFAULT) { wordList.clear(); }
-    QHelpSearchQuery(FieldName field, const QStringList &wordList)
-        : fieldName(field), wordList(wordList) {}
+    QHelpSearchQuery(FieldName field, const QStringList &wordList_)
+        : fieldName(field), wordList(wordList_) {}
 
     FieldName fieldName;
     QStringList wordList;