Fix zfs_sb_teardown/zfs_resume_fs NULL dereference

Fix a pair of conditions in which a concurrent umount can cause
NULL pointer dereferences:

* zfs_sb_teardown - prevent a NULL dereference by not calling
                    dmu_objset_pool with a null z_os.

* zfs_resume_fs - don't try to unmount with a null z_os.  This
                  change makes the ZoL code more consistent
                  with both Illumos and FreeBSD.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1543