Synopsis:

        sys_fhunlock(file_handle,position)

Arguments:

        file_handle       -   The file handle

        position            - The byte offset in the file to unlock

Description:   This function allows a task to release a lock it previously obtained by a call to sys_fhlock().     The current task must have made a sucessful call to sys_fhlock() for a region starting at the same byte position.

Note that locks are automatically removed and files all closed if a task stops or is killed (including if it encounters a restart statement or chains to another task).

Return Value:

Returns 0 on sucess or a negative error code.