#f bad as select timeout argument

["Robert E. Brown" <brownb@jany.gs.com>]

Passing #f as the optional timeout parameter to select or select! generates
an error.  I'm using scsh version 0.5 on a Solaris host.

Here's an example:

    Scsh 0.5
    > (select (vector (current-input-port)) (vector) (vector) #f)

    Error: Bad argument
           #f
           #{Procedure 126 real?}
           #{Procedure 8846 select!/copyback/errno}

Let me know if you need more information.

                                bob