Yu Watanabe
0e27527170
After 4b30f2e135, reading stable_secret
sysctl property fails with -ENOMEM, instead of -EIO.
This is due to read_full_virtual_file() uses read() as the backend while
read_one_line_file() uses fgetc(). And each functions return different
error on fails.
Anyway, the failure is harmless here. So, the log message and comment is
updated.
Closes one of the issues in #19410.
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