move init from gsm_bts_alloc_register() to gsm_bts_alloc(); fix gsm0408_test

gsm_bts_alloc() ought to do all static initialization, so that e.g. unit tests
can use an initialized bts struct that is fully usable, just not registered at
the gsm_network.

For example, two INIT_LLIST_HEAD() and various system information data pointers
(pointing to proper places within the same bts struct) should definitely never
be omitted.

This fixes the remaining errors of gsm0408_test's SI tests, as revealed by a
sanitizer build using gcc (Debian 7.3.0-12) 7.3.0.

Fixes:

  ../../../../src/osmo-bsc/src/libbsc/system_information.c:613:3: runtime error: null pointer passed as argument 1, which is declared to never be null

Initializing the bts->si_common.rach_control results in different expected
bytes for SI2. The initialized values are

  bts->si_common.rach_control.re = 1; /* no re-establishment */
  bts->si_common.rach_control.tx_integer = 9;  /* 12 slots spread - 217/115 slots delay */
  bts->si_common.rach_control.max_trans = 3; /* 7 retransmissions */
  bts->si_common.rach_control.t2 = 4; /* no emergency calls */

Causing a change to e5 04. 04 is t2 = 4, and the remaining values are verified by:

  uint8_t re :1,
           cell_bar :1,
           tx_integer :4,
           max_trans :2;

  >>> hex(1 + (9 << 2) + (3 << 6))
  '0xe5'

Change-Id: I13ef24bbe0f1fbe49465e67a0b67d6fd69fff3b1
2 files changed