[PATCH v2] selftests: arm64: Check fread return value in exec_target

[Mark Brown]

On Fri, Aug 08, 2025 at 01:38:30PM +0530, Bala-Vignesh-Reddy wrote:
> Fix -Wunused-result warning generated when compiled with gcc 13.3.0,
> by checking fread's return value and handling errors, preventing
> potential failures when reading from stdin.
> 
> Fixes compiler warning:
> warning: ignoring return value of 'fread' declared with attribute
> 'warn_unused_result' [-Wunused-result]

Reviewed-by: Mark Brown <broonie at kernel.org>
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