kill check_acl callback of generic_permission()

its value depends only on inode and does not change; we might as
well store it in ->i_op->check_acl and be done with that.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/reiserfs/file.c b/fs/reiserfs/file.c
index 91f080c..bbf3100 100644
--- a/fs/reiserfs/file.c
+++ b/fs/reiserfs/file.c
@@ -312,4 +312,5 @@
 	.listxattr = reiserfs_listxattr,
 	.removexattr = reiserfs_removexattr,
 	.permission = reiserfs_permission,
+	.check_acl = reiserfs_check_acl,
 };