message: core: fix convertTo() AVX2 optimization
diff: @@ -3678,7 +3678,7 @@ cvtScale_<short, int, float>( const short* src, size_t sstep,
  if (CV_CPU_HAS_SUPPORT_AVX2)
  {
  opt_AVX2::cvtScale_s16s32f32Line_AVX2(src, dst, scale, shift, size.width);
  - return;
  + continue;
  }
  #endif
  #if CV_SSE2
  