Changes

nokia: Fix unitialized access

/osmo-bsc/src/osmo-bsc/bts_nokia_site.c:1903:36: error: 'bcch_trx_nr' may be used uninitialized [-Werror=maybe-uninitialized]
 1903 |                                 if (trx->nr != bcch_trx_nr) {
      |

Change-Id: I6bfdefb44235291a5a1f1c72e5a5149d15e19b8f