PVS-Studio warning V564 for Chromium

enum FontStyle {
  NORMAL = 0,
  BOLD = 1,
  ITALIC = 2,
  UNDERLINE = 4,
};

void LabelButton::SetIsDefault(bool is_default) {
  ....
  style = is_default ? style | gfx::Font::BOLD :
                       style & !gfx::Font::BOLD;
  ....
}

This is what should have been written here: style = is_default ? style | gfx::Font::BOLD : style & ~gfx::Font::BOLD;

This suspicious code was found in Chromium project by PVS-Studio static code analyzer.
Warning message is:
V564 The '&' operator is applied to bool type value. You've probably forgotten to include parentheses or intended to use the '&&' operator. label_button.cc 131

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/