[RFC] perf script: Completing error handling?

[Markus Elfring]

Hello,

I noticed that source code like “printed += fprintf(fp, …)” is used
in some function implementations.
https://elixir.bootlin.com/linux/v6.10/source/tools/perf/builtin-script.c#L697

I find that return values should be checked somehow at 63 places.

See also:
* https://cwe.mitre.org/data/definitions/252.html

* https://wiki.sei.cmu.edu/confluence/display/c/POS54-C.+Detect+and+handle+POSIX+library+errors


Regards,
Markus