fix a few warnings

Author: Grok Compression

src/lib/core/wavelet/WaveletReverse.cpp

@@ -1489,8 +1489,9 @@ void WaveletReverse::v_16_53(const dwt_scratch<int16_t>* scratch, Buffer2dSimple
         for(uint32_t c = 0; c < nb_cols; c++, winL.buf_++, winH.buf_++, winDest.buf_++)
         {
           scratch->mem[1] = (int16_t)(winL.buf_[0] - ((winH.buf_[0] + 1) >> 1));
-          winDest.buf_[0] = std::clamp<int16_t>(winH.buf_[0] + scratch->mem[1] + dc, dcMin, dcMax);
-          winDest.buf_[1] = std::clamp<int16_t>(scratch->mem[1] + dc, dcMin, dcMax);
+          winDest.buf_[0] =
+              (int16_t)std::clamp<int32_t>(winH.buf_[0] + scratch->mem[1] + dc, dcMin, dcMax);
+          winDest.buf_[1] = (int16_t)std::clamp<int32_t>(scratch->mem[1] + dc, dcMin, dcMax);
         }
       }
       else

src/lib/core/wavelet/WaveletReverse97_16.cpp

@@ -649,7 +649,7 @@ namespace HWY_NAMESPACE
    *
    *  All arithmetic stays in int16 since dc_shift and dc_max fit for ≤12-bit.
    **************************************************************************/
-  static void scalar_v_synth_16_97_dc(int16_t* scratch, uint32_t height, const int16_t* bandL,
+  [[maybe_unused]] static void scalar_v_synth_16_97_dc(int16_t* scratch, uint32_t height, const int16_t* bandL,
                                       uint32_t strideL, const int16_t* bandH, uint32_t strideH,
                                       int16_t* dest, uint32_t strideDest, uint32_t parity,
                                       uint32_t sn, uint32_t dn, int16_t dc, int16_t dcMin,