The inode destruction path for the 'dax' device filesystem incorrectly
assumes that the inode was initialized through 'alloc_dax()'. However,
if someone attempts to directly mount the dax filesystem with 'mount -t
dax dax mnt' that will bypass 'alloc_dax()' and the following failure
signatures may occur as a result:

 kill_dax() must be called before final iput()
 WARNING: CPU: 2 PID: 1188 at drivers/dax/super.c:243 dax_destroy_inode+0x48/0x50
 RIP: 0010:dax_destroy_inode+0x48/0x50
 Call Trace:
  destroy_inode+0x3b/0x60
  evict+0x139/0x1c0
  iput+0x1f9/0x2d0
  dentry_unlink_inode+0xc3/0x160
  __dentry_kill+0xcf/0x180
  ? dput+0x37/0x3b0
  dput+0x3a3/0x3b0
  do_one_tree+0x36/0x40
  shrink_dcache_for_umount+0x2d/0x90
  generic_shutdown_super+0x1f/0x120
  kill_anon_super+0x12/0x20
  deactivate_locked_super+0x43/0x70
  deactivate_super+0x4e/0x60

 general protection fault: 0000 [#1] SMP DEBUG_PAGEALLOC
 RIP: 0010:kfree+0x6d/0x290
 Call Trace:
  <IRQ>
  dax_i_callback+0x22/0x60
  ? dax_destroy_inode+0x50/0x50
  rcu_process_callbacks+0x298/0x740

 ida_remove called for id=0 which is not allocated.
 WARNING: CPU: 0 PID: 0 at lib/idr.c:383 ida_remove+0x110/0x120
 [..]
 Call Trace:
  <IRQ>
  ida_simple_remove+0x2b/0x50
  ? dax_destroy_inode+0x50/0x50
  dax_i_callback+0x3c/0x60
  rcu_process_callbacks+0x298/0x740

Add missing initialization of the 'struct dax_device' and inode so that
the destruction path does not kfree() or ida_simple_remove()
uninitialized data.

Fixes: 7b6be844 ("dax: refactor dax-fs into a generic provider of 'struct dax_device' instances")
Reported-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>