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Fix
ksft.h: In function ‘ksft_ready’:
ksft.h:27:9: warning: ignoring return value of ‘write’ declared with attribute ‘warn_unused_result’
ksft.h: In function ‘ksft_wait’:
ksft.h:51:9: warning: ignoring return value of ‘read’ declared with attribute ‘warn_unused_result’
by checking the return value of the affected functions and displaying
an error message if an error is seen.
Fixes: 2b6d490b82668 ("selftests: drv-net: Factor out ksft C helpers")
Cc: Joe Damato <jdamato@fastly.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Link: https://patch.msgid.link/20251205171010.515236-11-linux@roeck-us.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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