dont use the malloc ks_limit in softdeps

[David Gwynne]

the only thing using ks_limit is the ffs softdep code.

this cleans that up.

ok?

Index: ffs/ffs_softdep.c
===================================================================
RCS file: /cvs/src/sys/ufs/ffs/ffs_softdep.c,v
retrieving revision 1.135
diff -u -p -r1.135 ffs_softdep.c
--- ffs/ffs_softdep.c   7 Nov 2016 00:26:33 -0000       1.135
+++ ffs/ffs_softdep.c   3 Jul 2017 06:26:41 -0000
@@ -1159,12 +1159,7 @@ softdep_initialize(void)
 
        LIST_INIT(&mkdirlisthd);
        LIST_INIT(&softdep_workitem_pending);
-#ifdef KMEMSTATS
-       max_softdeps = min (initialvnodes * 8,
-           kmemstats[M_INODEDEP].ks_limit / (2 * sizeof(struct inodedep)));
-#else
-       max_softdeps = initialvnodes * 4;
-#endif
+       max_softdeps = initialvnodes * 8;
        arc4random_buf(&softdep_hashkey, sizeof(softdep_hashkey));
        pagedep_hashtbl = hashinit(initialvnodes / 5, M_PAGEDEP, M_WAITOK,
            &pagedep_hash);