[Patch, libfortran, 2nd version] PR 48618 - Negative unit number in OPEN(...) is sometimes allowed

[Tilo Schwarz]

Hi,

this patch fixes PR 48618.

Built and regtested on Linux 3.2.0-4-686-pae.

Thanks for input and corrections to Tobias Burnus.


Regards,

	Tilo
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