Don't use return keyword when not necessary

Change-Id: I4b9fad1eee60e942ddbccda53a4af27e978df498
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/libs/utils/completinglineedit.cpp

@@ -62,7 +62,7 @@ void CompletingLineEdit::keyPressEvent(QKeyEvent *e)
                 comp->complete();
         }
     }
-    return QLineEdit::keyPressEvent(e);
+    QLineEdit::keyPressEvent(e);
 }
 
 } // namespace Utils