[Asterisk-bugs] translate.c

[Igor Nikolaev]

I think in file translate.c in function
  struct ast_trans_pvt *ast_translator_build_path(int dest, int source)
after
  source = powerof(source); dest = powerof(dest);
we must test values `source` and `dest` before reference to
test tr_matrix[source][dest].step` for correct values, for exapmle
  if ( source == -1 || dest == -1 ) return NULL;
function powerof can return value '-1' and
tr_matrix[source][dest] can be incorrect memory pointer.

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I