message: Fix convertFp16 in JavaScript build
diff: @@ -1398,7 +1398,7 @@ cvtScaleHalf_<short, float>( const short* src, size_t sstep, float* dst, size_t
  #define DEF_CVT_SCALE_FP16_FUNC(suffix, stype, dtype) \
  static void cvtScaleHalf##suffix( const stype* src, size_t sstep, \
  -dtype* dst, size_t dstep, Size size) \
  +dtype* dst, size_t dstep, Size size, void*) \
  { \
  cvtScaleHalf_<stype,dtype>(src, sstep, dst, dstep, size); \
  }
  