LU-4462 mdt: don't apply mdt_object_fid() to ERR_PTRs

In mdt_reconstruct_open(), mdt_reconstruct_create(), and
mdt_reconstruct_setattr() print the FID from the request rather than
applying mdt_object_fid() to a known ERR_PTR.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: Ifb9365dbef1492d8fb5c7ff27d00f5155b0e7525
Reviewed-on: http://review.whamcloud.com/8788
Tested-by: Jenkins
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>