Removes a branch from a transaction and returns the outcome of
    the transaction. $END_BRANCHW always waits for the request to
    complete before returning to the caller. Other than this, it is
    identical to $END_BRANCH.

    Format

      SYS$END_BRANCHW  [efn] ,[flags] ,iosb ,[astadr] ,[astprm] ,tid

                       ,bid

    C Prototype

      int sys$end_branchw  (unsigned int efn, unsigned int

                           flags, struct _iosb *iosb, void

                           (*astadr)(__unknown_params), int astprm,

                           unsigned int tid [4], unsigned int bid

                           [4]);