Use integer division in TiffBinaryArray::doCount

doCount() uses std::lround(double(size) / typeSize) which rounds
to the nearest integer. When size is not a multiple of typeSize,
this can round up and report more elements than the data holds.
On re-read, the inflated count causes the parser to expect more
data than exists.

Use integer division instead, which truncates and is consistent
with how readTiffEntry computes size from count and typeSize.

Author: MarkLee131

src/tiffcomposite_int.cpp

@@ -795,7 +795,7 @@ size_t TiffBinaryArray::doCount() const {
     typeSize = 1;
   }
 
-  return std::lround(static_cast<double>(size()) / typeSize);
+  return size() / typeSize;
 }
 
 size_t TiffBinaryElement::doCount() const {