Fix for bug 178801: missing &:: caused function not to be found, resulting in server error

Bugzilla/Search.pm

@@ -852,7 +852,7 @@ sub init {
                 # chart -1 is generated by other code above, not from the user-
                 # submitted form, so we'll blindly accept any values in chart -1
                 if ((!$chartfields{$f}) && ($chart != -1)) {
-                    ThrowCodeError("invalid_field_name", {field => $f});
+                    &::ThrowCodeError("invalid_field_name", {field => $f});
                 }
 
                 # This is either from the internal chart (in which case we