Write-strings warning fix

[Dan Hipschman]

On Fri, Aug 25, 2006 at 11:08:03AM +0100, Andrew Talbot wrote:
> What confused me - especially with my ignorance of yacc - is that I couldn't
> find a corresponding xmalloc() that assigns the char * variables that the
> above free() frees. make_var() gains storage for a var_t type, but the
> free() in get_type() releases the storage of a char *. I couldn't quite
> follow what was going on, there. Is it because the string is the first
> element in the structure, so the pointer to the string also points to the
> start of the var_t type?

The strings are allocated in the lexer (parser.l):

        yylval.str = xstrdup(kw);

The patch that was actually committed (using xstrdup) is most consistent.