13902 Fix for 13717 may break 8-disk raidz2
13915 installctx() blocking allocate causes problems
Portions contributed by: Jerry Jelinek <gjelinek@gmail.com>
Change-Id: I934d69946cec42630fc541fa8c7385b862b69ca2

@@ -2214,11 +2214,11 @@
 
         vtc.vtc_vm = vm;
         vtc.vtc_vcpuid = vcpuid;
         vtc.vtc_status = 0;
         installctx(curthread, &vtc, vmm_savectx, vmm_restorectx, NULL, NULL,
-            NULL, vmm_freectx);
+            NULL, vmm_freectx, NULL);
 
         error = vm_entry_actions(vm, vcpuid, entry, vme);
         if (error != 0) {
                 goto exit;
         }