typo fix in symbol_printers_output

[Paul Eggert]

I installed this:

2003-01-17  Paul Eggert  <address@hidden>

        * src/output.c (symbol_printers_output): Fix typo that led
        to core dump.  Problem reported by Antonio Rus in
        <http://mail.gnu.org/archive/html/bug-bison/2003-01/msg00058.html>.

--- src/output.c        26 Dec 2002 08:25:56 -0000      1.216
+++ src/output.c        17 Jan 2003 08:43:08 -0000      1.217
@@ -432,7 +432,7 @@ symbol_printers_output (FILE *out)
 
   fputs ("m4_define([b4_symbol_printers], \n[", out);
   for (i = 0; i < nsyms; ++i)
-    if (symbols[i]->destructor)
+    if (symbols[i]->printer)
       {
        symbol *sym = symbols[i];