Fix memory leak after use XGetAtomName

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit ab525f2baa)

kdecore/netwm.cpp

@@ -4339,10 +4339,13 @@ void NETWinInfo::update(const unsigned long dirty_props[]) {
 
 		for (count = 0; count < nitems_ret; count++) {
 #ifdef NETWMDEBUG
+		    char* debug_action = XGetAtomName(p->display, (Atom) actions[count]);
 		    fprintf(stderr,
 			    "NETWinInfo::update:   adding allowed action %ld '%s'\n",
-			    actions[count],
-			    XGetAtomName(p->display, (Atom) actions[count]));
+			    actions[count], debug_action);
+		    if( debug_action ) {
+			XFree( debug_action );
+		    }
 #endif
 
 		    if ((Atom) actions[count] == net_wm_action_move)