[tex-k] [web2c] Catch return value from fgets()

[Andreas Scherer]

Am 11.11.18 um 23:30 schrieb Karl Berry:
> It clearly doesn't matter "much" since no one has ever reported
> strangeness, but nevertheless, return values should be checked.
> Patch would be welcome ... --thanks, karl.

Done, see attachment.

Best,
Andreas
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