staging: lustre: clio: add debug message in osc_completion()

staging: lustre: clio: add debug message in osc_completion()

Replace LASSERT with LASSERTF in osc_completion, thus we can get
more info when the LASSERT is triggered.

Signed-off-by: Niu Yawei <yawei.niu@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3843
Reviewed-on: http://review.whamcloud.com/7494
Reviewed-by: Bobi Jam <bobijam@gmail.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@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>