Fix paging #PF, simplify init_tasks

Unsure what fixed the paging #PF in init_tasks, but allocating a page
now works as expected. Originally a #PF would occur if alloc_page was
called after a certain point in init_tasks.
diff --git a/src/kernel/Jmk2 b/src/kernel/Jmk2
index ffd134c..57a657a 100644
--- a/src/kernel/Jmk2
+++ b/src/kernel/Jmk2
@@ -16,3 +16,5 @@
 }
 
 type custom_link
+
+jmk_finalize