FROMLIST: kselftest: Add a ksft_perror() helper

[ Upstream commit 907f3302 ]

The standard library perror() function provides a convenient way to print
an error message based on the current errno but this doesn't play nicely
with KTAP output. Provide a helper which does an equivalent thing in a KTAP
compatible format.

nolibc doesn't have a strerror() and adding the table of strings required
doesn't seem like a good fit for what it's trying to do so when we're using
that only print the errno.

Change-Id: I92f9e363ef1477c983122b7750527598c75bf16b
Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Stable-dep-of: 071af0c9 ("selftests: timers: Convert posix_timers test to generate KTAP output")
Link: https://lore.kernel.org/stable/20240430004909.425336-1-edliaw@google.com/T/#u


Signed-off-by: Edward Liaw <edliaw@google.com>
Fixes: 071af0c9 ("selftests: timers: Convert posix_timers test to generate KTAP output")