/sys$common/syshlp/helplib.hlb CC, Messages, IGNORECALLVAL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        <Context> the value returned from the function
                "<expression>" is not used - if this is intended, it
                should be cast to "void".

 Description    A function that returns a value has been invoked, yet
                the value was not used.  This might not have been
                what you intended.

 User Action    Cast the function to void to suppress the message.