PVS-Studio warning V648 for Wolf

inline int operator!=( quat_t a, quat_t b )
{
  return ( ( a.x != b.x ) || ( a.y != b.y ) ||
           ( a.z != b.z ) && ( a.w != b.w ) );
}

Most likely this is what should be written here: ( a.z != b.z ) || ( a.w != b.w ).

This suspicious code was found in Wolf project by PVS-Studio static code analyzer.
Warning message is:
V648 Priority of the '&&' operation is higher than that of the '||' operation. math_quaternion.h 167

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/