Fix FTBFS with stricter C++11

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

src/part/radialMap/map.cpp

@@ -351,7 +351,7 @@ RadialMap::Map::paint( unsigned int scaleFactor )
             //draw arrow head to indicate undisplayed files/directories
             TQPointArray pts( 3 );
             TQPoint pos, cpos = rect.center();
-            int a[3] = { (*it)->start(), (*it)->length(), 0 };
+            unsigned int a[3] = { (*it)->start(), (*it)->length(), 0 };
 
             a[2] = a[0] + (a[1] / 2); //assign to halfway between
             if( a[1] > a_max )