fix warning

tools/stats/counts

@@ -19,7 +19,9 @@ while (<LISTS>) {
   $lists++;
 
   open(CONFIG, "$symparoot/expl/$list/config") or warn "cannot open config for $list\n";
-  -f CONFIG and sysread CONFIG, my $_, -s CONFIG;
+  -f CONFIG and sysread CONFIG, my $value, -s CONFIG;
+
+  $_ = $value;
 
   $found=0;