[Patch] Fix libstdc++/9182

[Paolo Carlini]

Hi,

quite straightworward: just add some error checks.

Tested x86-linux, good for 3_3 too, I think.

Benjamin, as a follow up I have in the making a fix for
libstdc++/9875, but perhaps you mean to reorganize 27_io before?

(otherwise, I have also a couple of other patches queued, one,
for libstdc++/9826, quite obvious, IMHO)

Thanks,
Paolo.

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