geom/m46512: fix incorrect calculation of num_leaf_points_minus2

A leaf node by definition contains at least one point.  Therefore the
single point flag indicates if there are one or two points in the leaf.
The remainder should be signalled as numpoints - 2 as per the working
draft text.

tmc3/geometry_octree_decoder.cpp

@@ -134,8 +134,9 @@ GeometryOctreeDecoder::decodePositionLeafNumPoints()
 
   int count = 1;
   if (!isSinglePoint) {
-    count += _arithmeticDecoder->decodeExpGolomb(
-      0, _ctxEquiProb, _ctxPointCountPerBlock);
+    count += 1
+      + _arithmeticDecoder->decodeExpGolomb(
+          0, _ctxEquiProb, _ctxPointCountPerBlock);
   }
 
   return count;

tmc3/geometry_octree_encoder.cpp

@@ -146,7 +146,7 @@ GeometryOctreeEncoder::encodePositionLeafNumPoints(int count)
   } else {
     _arithmeticEncoder->encode(0, _ctxSinglePointPerBlock);
     _arithmeticEncoder->encodeExpGolomb(
-      uint32_t(count - 1), 0, _ctxEquiProb, _ctxPointCountPerBlock);
+      uint32_t(count - 2), 0, _ctxEquiProb, _ctxPointCountPerBlock);
   }
 
   return count;

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