PVS-Studio warning V560 for Regex

#define ctype_digit   0x04

static BOOL
compile_branch(....)
{
  ...
  else if ((digitab[ptr[1]] && ctype_digit) != 0)
  ...
}

This is what should have been written here: &.

This suspicious code was found in Regex project by PVS-Studio static code analyzer.
Warning message is:
V560 A part of conditional expression is always true: 0x04. Regex pcre.c 2887

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/