[Patch, libgfortran] Make sclose return value match POSIX

[Janne Blomqvist]

Hi,

One of the design goals of the new gfortran low level I/O library was to
match POSIX as far as possible. The attached patch fixes the stream
close operation to always return POSIX compatible values, and fixes the
callers.

After regtesting on i686-pc-linux-gnu, committed r145761 as obvious.



-- 
Janne Blomqvist
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