staging: lustre: llite: lower message level for ll_setattr_raw()

Truncate and write can happen at the same time, so that a file can
be set modified even though the file is not restored from released
state, and ll_hsm_state_set() is not applicable for the file, and
it will return error in this case, we'd lower the error message level
in this case.

Signed-off-by: Bobi Jam <bobijam.xu@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-6817
Reviewed-on: http://review.whamcloud.com/15541


Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>