PVS-Studio warning V560 for FireFlies

static size_type const embedded_block = 1;
static size_type const first_block = 8;

template
<typename Key, typename T, typename HashCompare, typename A>
void concurrent_hash_map<Key,T,HashCompare,A>::clear() {
  ...
  else if(s == embedded_block && embedded_block != first_block)
  ...
}

This suspicious code was found in FireFlies project by PVS-Studio static code analyzer.
Warning message is:
V560 A part of conditional expression is always true: embedded_block != first_block. Fireflies concurrent_hash_map.h 1299

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/