chrono.cc build failure in maintainer-mode

[Ralf Wildenhues]

I'm getting a build failure with --enable-maintainer-mode (which turns
on -Werror) on trunk:

cc1plus: warnings being treated as errors
../../../../gcc/libstdc++-v3/src/chrono.cc: In static member function ‘static std::chrono::system_clock::time_point std::chrono::system_clock::now()’:
../../../../gcc/libstdc++-v3/src/chrono.cc:56:40: error: suggest parentheses around ‘&&’ within ‘||’

Aside, it seems weird that the compiler refers to && and || which do not
occur in chrono.cc.  Wrong error location?

Should I open a PR?

Thanks,
Ralf