[SCSI] aacraid: probe related code cleanup

[SCSI] aacraid: probe related code cleanup

Sundry cleanups:
1) Use kzalloc instead of kmalloc.
2) Make sure probe worked before recalling the SCSI command to finalize
processing.
3) _aac_probe_container2 and _aac_probe_container1 return value goes
unused, change return to void.
4) Use a lower depth pointer reference to pick up the driver instance
variable.
5) Although effectively unused except to fake for scsicmd validity, set
the scsi_done in probe code to aac_probe_container_callback1 instead of
the less valid dummy reference to _aac_probe_container1.
6) SCp.phase is set in aac_valid_context, drop setting up this value in
caller when unnecessary.
7) take container target id at the beginning, rather than referencing
scmd_id() to pick it up.

There should be no side effects or functionality changes.

Signed-off-by: Mark Salyzyn <aacraid@adaptec.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>