fix compilation error

GitOrigin-RevId: 20b5add31a628fd040e1f20c103d330dfa3c7652

tdutils/td/utils/HazardPointers.h

@@ -20,7 +20,7 @@ class HazardPointers {
   explicit HazardPointers(size_t threads_n) : threads_(threads_n) {
     for (auto &data : threads_) {
       for (auto &ptr : data.hazard) {
-        std::atomic_init(&ptr, nullptr);
+        std::atomic_init(&ptr, static_cast<T *>(nullptr));
       }
     }
   }

tdutils/td/utils/buffer.cpp

@@ -100,15 +100,7 @@ BufferRaw *BufferAllocator::create_buffer_raw(size_t size) {
   }
   buffer_mem += buf_size;
   auto *buffer_raw = reinterpret_cast<BufferRaw *>(new char[buf_size]);
-  new (buffer_raw) BufferRaw();
-  buffer_raw->data_size_ = size;
-  buffer_raw->begin_ = 0;
-  std::atomic_init(&buffer_raw->end_, 0);
-
-  std::atomic_init(&buffer_raw->ref_cnt_, 1);
-  std::atomic_init(&buffer_raw->has_writer_, true);
-  buffer_raw->was_reader_ = false;
-  return buffer_raw;
+  return new (buffer_raw) BufferRaw(size);
 }
 
 void BufferBuilder::append(BufferSlice slice) {

tdutils/td/utils/buffer.h

@@ -20,6 +20,9 @@
 namespace td {
 
 struct BufferRaw {
+  explicit BufferRaw(size_t size)
+      : data_size_(size), begin_(0), end_(0), ref_cnt_(1), has_writer_(true), was_reader_(false) {
+  }
   size_t data_size_;
 
   // Constant after first reader is created.