bug#37716: grep exit status with -L redirected to /dev/null

[Paul Jackson]

Also it seems that if the output of "grep -L" is redirected
to "/dev/tty", then the exit status of grep is reversed if
also using the "-q" option.

If the output of "grep -L"  is redirected to "/dev/null", then
its exit status polarity is not reversed by the "-q" option.

-- 
                Paul Jackson
                address@hidden