Fix a gcc12 compiling warning/error
Fix a gcc12 compiling error: member ‘BestEncInfoCache::m_dummyPool’ is used uninitialized [-Werror=uninitialized]) 894 | BestEncInfoCache() : m_slice_bencinf(nullptr), m_dummyCS(m_dummyPool) {} | ^~~~~~~~~~~
Fix a gcc12 compiling error: member ‘BestEncInfoCache::m_dummyPool’ is used uninitialized [-Werror=uninitialized]) 894 | BestEncInfoCache() : m_slice_bencinf(nullptr), m_dummyCS(m_dummyPool) {} | ^~~~~~~~~~~