ctld: Catch exceptions by reference instead of by value

Reported by:	GCC -Wcatch-value
Sponsored by:	Chelsio Communications

usr.sbin/ctld/conf.cc

@@ -466,7 +466,7 @@ parse_conf(const char *path)
 	bool parsed;
 	try {
 		parsed = yyparse_conf(fp.get());
-	} catch (std::bad_alloc) {
+	} catch (std::bad_alloc &) {
 		log_warnx("failed to allocate memory parsing %s", path);
 		return (false);
 	} catch (...) {

usr.sbin/ctld/uclparse.cc

@@ -1418,7 +1418,7 @@ uclparse_conf(const char *path)
 	bool parsed;
 	try {
 		parsed = uclparse_toplevel(top);
-	} catch (std::bad_alloc) {
+	} catch (std::bad_alloc &) {
 		log_warnx("failed to allocate memory parsing %s", path);
 		parsed = false;
 	} catch (...) {