std::min() requires same type (pytorch#732)

* std::min() requires same type * cast buffer instead * declare buffer_size as int64_t

Author: kashif

torch/csrc/generic/serialization.cpp

@@ -49,7 +49,7 @@ void THPStorage_(writeFileRaw)(THStorage *self, int fd)
  remaining -= result;
  }
  } else {
- long buffer_size = std::min(self->size, (long)5000);
+ int64_t buffer_size = std::min(self->size, (long)5000);
  std::unique_ptr<uint8_t[]> le_buffer(new uint8_t[buffer_size * sizeof(real)]);
  for (int64_t i = 0; i < self->size; i += buffer_size) {
  size_t to_convert = std::min(self->size - i, buffer_size);
@@ -100,7 +100,7 @@ THStorage * THPStorage_(readFileRaw)(int fd)
  remaining -= result;
  }
  } else {
- long buffer_size = std::min(size, (long)5000);
+ int64_t buffer_size = std::min(size, (long)5000);
  std::unique_ptr<uint8_t[]> le_buffer(new uint8_t[buffer_size * sizeof(real)]);
  for (int64_t i = 0; i < size; i += buffer_size) {
  size_t to_convert = std::min(size - i, buffer_size);