kunit: Handle thread creation error

Previously, if a thread creation failed (e.g. -ENOMEM), the function was
called (kunit_catch_run_case or kunit_catch_run_case_cleanup) without
marking the test as failed.  Instead, fill try_result with the error
code returned by kthread_run(), which will mark the test as failed and
print "internal error occurred...".

Cc: Brendan Higgins <[email protected]>
Cc: Shuah Khan <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Reviewed-by: Rae Moar <[email protected]>
Reviewed-by: David Gow <[email protected]>
Signed-off-by: Mickaël Salaün <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Shuah Khan <[email protected]>

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