* We didn't handle proper E1/T1 transitions after device registration.
* Fix SPAN_REGISTERED(xpd):
It now checks for DAHDI_FLAGBIT_REGISTERED as well, as this flag is
set/clear by assign/unassign.
* From set_pri_proto():
- Always free/allocate channels
- Always call dahdi_init_span()
* Improve phonedev_cleanup() safety:
- NULL pointers after free.
- Zero number of channels at the end.
* Refactor channel allocation out of phonedev_init():
- Into phonedev_alloc_channels()
- Also called from xpd_init_span() to prevent duplicated logic.
- And called from set_pri_proto() to prevent our bug.
Signed-off-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>
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