PATCH: Remove and unneede NULL check at CreateServiceA/W and ChangeServiceConfigW/A()

CreateServiceA and ChangeServiceConfigA:
We already know that lpPassword != NULL so checking again doesnt have too much sense.

CreateServiceW and ChangeServiceConfigW:
Surround the code checking if lpPassword is passed, same as their A logic counterpart APIs. It doesnt have sense to make lpEncryptedPassword to point to a NULL pointer.

It also fixes CID 1363471 and CID 1363479