Fix FTBFS due to narrowing conversion from 'unsigned int' to 'int'.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 93d4c006af)

src/kmplayer_smil.cpp

@@ -2312,7 +2312,7 @@ KDE_NO_EXPORT NodeRefListPtr SMIL::TimedMrl::listeners (unsigned int id) {
 }
 
 KDE_NO_EXPORT bool SMIL::TimedMrl::handleEvent (EventPtr event) {
-    int id = event->id ();
+    unsigned int id = event->id ();
     switch (id) {
         case event_timer: {
             TimerEvent * te = static_cast <TimerEvent *> (event.ptr ());