Fix clazy warning

src/kontactplugin/korganizer/summaryeventinfo.cpp

@@ -70,7 +70,7 @@ SummaryEventInfo::SummaryEventInfo()
 }
 
 /**static*/
-SummaryEventInfo::List SummaryEventInfo::eventsForRange(const QDate &start, const QDate &end, const Akonadi::ETMCalendar::Ptr &calendar)
+SummaryEventInfo::List SummaryEventInfo::eventsForRange(QDate start, QDate end, const Akonadi::ETMCalendar::Ptr &calendar)
 {
     KCalendarCore::Event::List allEvents = calendar->events();
     KCalendarCore::Event::List events;
@@ -261,7 +261,7 @@ SummaryEventInfo::List SummaryEventInfo::eventsForRange(const QDate &start, cons
     return eventInfoList;
 }
 
-SummaryEventInfo::List SummaryEventInfo::eventsForDate(const QDate &date, const Akonadi::ETMCalendar::Ptr &calendar)
+SummaryEventInfo::List SummaryEventInfo::eventsForDate(QDate date, const Akonadi::ETMCalendar::Ptr &calendar)
 {
     return eventsForRange(date, date, calendar);
 }

src/kontactplugin/korganizer/summaryeventinfo.h

@@ -20,9 +20,9 @@ public:
 
     SummaryEventInfo();
 
-    static List eventsForDate(const QDate &date, const Akonadi::ETMCalendar::Ptr &calendar);
-    static List eventsForRange(const QDate &start,
-                               const QDate &end, // range is inclusive
+    static List eventsForDate(QDate date, const Akonadi::ETMCalendar::Ptr &calendar);
+    static List eventsForRange(QDate start,
+                               QDate end, // range is inclusive
                                const Akonadi::ETMCalendar::Ptr &calendar);
     static void setShowSpecialEvents(bool skipBirthdays, bool skipAnniversaries);