LU-6627 mdc: quiet console message for known -EINTR

LU-6627 mdc: quiet console message for known -EINTR

If a user process is waiting for MDS recovery during close, but the
process is interrupted, the file is still closed but it prints a
message on the console.  Quiet the console message for -EINTR, since
this is expected behaviour.

Fix code style issues in this function.

Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Change-Id: I3bc7284bb7014dbaeb9bfb27a4e98a8abb4a54b6
Reviewed-on: http://review.whamcloud.com/14911
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Frank Zago <fzago@cray.com>
Reviewed-by: Emoly Liu <emoly.liu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>