10592 misc. metaslab and vdev related ZoL bug fixes
Portions contributed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed by: Giuseppe Di Natale <guss80@gmail.com>
Reviewed by: George Melikov <mail@gmelikov.ru>
Reviewed by: Paul Dagnelie <pcd@delphix.com>
Reviewed by: Matt Ahrens <mahrens@delphix.com>
Reviewed by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed by: Tony Hutter <hutter2@llnl.gov>
Reviewed by: Kody Kantor <kody.kantor@joyent.com>
Approved by: Dan McDonald <danmcd@joyent.com>

@@ -555,10 +555,11 @@
 {
         load_obsolete_space_map_arg_t losma;
         losma.losma_counts = counts;
         losma.losma_vim = vim;
         VERIFY0(space_map_iterate(obsolete_space_sm,
+            space_map_length(obsolete_space_sm),
             load_obsolete_sm_callback, &losma));
 }
 
 /*
  * Read the obsolete counts from disk, returning them in an array.