FS-Cache: Don't override netfs's primary_index if registering failed
Only override netfs->primary_index when registering success. Cc: stable@vger.kernel.org # v2.6.30+ Signed-off-by: Kinglong Mee <kinglongmee@gmail.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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