[Filesystems-devel] Bug#777559: [aufs-tools] auplink crashes

[Henrik Ahlgren]

Tags: patch

When AuFin is called with errno = 0, error_at_line(3) does not exit. The
attached patch sets errno to EINVAL following the pattern in most
other similar error checks in aufs-tools.

With this change "auplink / flush" outputs the following error
message and exists without segfaulting:

auplink:plink.c:342: no aufs mount point: Invalid argument

This bug causes docker core files to appear in docker container's root
directory.

Henrik
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