cast fix

Author: DedeHai

wled00/FX_fcn.cpp

@@ -648,9 +648,9 @@ uint16_t Segment::virtualLength() const {
 #ifndef WLED_DISABLE_2D
 // maximum length of a mapped 1D segment, used in PS for buffer allocation
 uint16_t Segment::maxMappingLength() const {
-  unsigned vW = virtualWidth();
-  unsigned vH = virtualHeight();
-  return max(sqrt32_bw(vH*vH + vW*vW), (unsigned)getPinwheelLength(vW, vH)); // use diagonal
+  uint32_t vW = virtualWidth();
+  uint32_t vH = virtualHeight();
+  return max(sqrt32_bw(vH*vH + vW*vW), (uint32_t)getPinwheelLength(vW, vH)); // use diagonal
 }
 #endif
 // pixel is clipped if it falls outside clipping range