staging/lustre: fix misuse of current->parent.

current->parent is used by ptrace to redirect some signal delivery
to the ptracer.  It should only be used by 'ptrace' or 'signal' code.
All other users should  use current->real_parent, which is the real
parent.
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/llite/lproc_llite.c

@@ -910,7 +910,7 @@ void ll_stats_ops_tally(struct ll_sb_info *sbi, int op, int count)
 		 sbi->ll_stats_track_id == current->pid)
 		lprocfs_counter_add(sbi->ll_stats, op, count);
 	else if (sbi->ll_stats_track_type == STATS_TRACK_PPID &&
-		 sbi->ll_stats_track_id == current->parent->pid)
+		 sbi->ll_stats_track_id == current->real_parent->pid)
 		lprocfs_counter_add(sbi->ll_stats, op, count);
 	else if (sbi->ll_stats_track_type == STATS_TRACK_GID &&
 		 sbi->ll_stats_track_id ==