ntpd question - double free?

[Axton]

In parse.y for OpenBSD's ntpd, would/could this result in a double free:

number          : STRING                        {
                       u_long                 ulval;
                       const char        *errstr;

                       ulval = strtonum($1, 0, INT_MAX, &errstr);
                       if (errstr) {
                               yyerror("\"%s\" invalid: %s", $1, errstr);
                               free($1);
                               YYERROR;
                       } else
                               $$ = ulval;
                       free($1);
               }
               ;

From 
http://www.openbsd.org/cgi-bin/cvsweb/src/usr.sbin/ntpd/parse.y?rev=1.30&content-type=text/x-cvsweb-markup

The if statement will free($1) if it is not a valid u_long, then at
the end of the block, there is a subsequent free($1).

I'm a C newbie and I'm trying to learn, so don't beat me with the clue
stick too hard.

Axton