Fix 'info (manual)slash/in/node'

* info/info.c (main, get_initial_file): Move code checking for
slash in argument to get_initial_file, and don't check for argument
as a file if it begins with '('.
(main): Move code adding user provided directory to INFOPATH
after call to get_initial_code.
(get_initial_file): Decrement argc as intended.

Arash Esbati <arash@gnu.org> reported that
"info '(latex2e)\indent & \noindent'" didn't work on Msys2.
2 files changed