[LTP] float_trigo: Fix acos/asin/atan input generation

[linuxtestproject.agent@gmail.com]

Hi Jan,

On Mon, 19 Oct 2026, Jan Stancek via ltp wrote:
> float_trigo: Fix acos/asin/atan input generation

Verdict - Reviewed

Pre-existing issue (low severity; separate follow-up):

In genacos.c, genasin.c and genatan.c, both create_*_file() functions
test open() with if (!fp) and ignore write() failures. An output path
that is a directory therefore makes either mode report success and exit
0 without producing data, both before and after this patch. Check
fp < 0, handle write() failures and propagate failure from main().

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