string: strerror must not return NULL (bug 30555)
For strerror, this fixes commit 28aff047 ("string: Implement strerror in terms of strerror_l"). This commit avoids returning NULL for strerror_l as well, although POSIX allows this behavior for strerror_l. Reviewed-by:Arjun Shankar <arjun@redhat.com>
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