3006 VERIFY[S,U,P] and ASSERT[S,U,P] frequently check if first argument is zero

*** 2241,2251 ****
                  sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE,
                      DMU_OT_NONE, 0, tx);
  
                  error = zap_add(os, MASTER_NODE_OBJ,
                      ZFS_SA_ATTRS, 8, 1, &sa_obj, tx);
!                 ASSERT3U(error, ==, 0);
  
                  VERIFY(0 == sa_set_sa_object(os, sa_obj));
                  sa_register_update_callback(os, zfs_sa_upgrade);
          }
  
--- 2241,2251 ----
                  sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE,
                      DMU_OT_NONE, 0, tx);
  
                  error = zap_add(os, MASTER_NODE_OBJ,
                      ZFS_SA_ATTRS, 8, 1, &sa_obj, tx);
!                 ASSERT0(error);
  
                  VERIFY(0 == sa_set_sa_object(os, sa_obj));
                  sa_register_update_callback(os, zfs_sa_upgrade);
          }