message: bitmap: fix null termination of debug strings
diff: @@ -243,11 +243,10 @@ public:
  bitCount = this->bitCount();
  d_assert(0 <= bitCount && static_cast<size_t>(bitCount) <= Super::_bitCount);
  - internal::string s(bitCount, '0');
  + internal::string s(bitCount+1, 0);
  for (ssize_t i = 0; i < bitCount; i++) {
  - if (isSet(i))
  - s[i] = '1';
  + s[i] = isSet(i) ? '1' : '0';
  }
  return s;
  