FS-Cache: Don't override netfs's primary_index if registering failed

commit b130ed59 upstream.

Only override netfs->primary_index when registering success.

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>
[lizf: Backported to 3.4: there are no n_active and flags in primary_index]
Signed-off-by: Zefan Li <lizefan@huawei.com>