libpayload: fix possible mem leak in get_option_as_string()

Change-Id: I7c3adbd1b72be81585bbaabb42532fc4cad57f58
Signed-off-by: Mathias Krause <mathias.krause@secunet.com>
Reviewed-on: http://review.coreboot.org/616
Tested-by: build bot (Jenkins)
Reviewed-by: Peter Stuge <peter@stuge.se>

payloads/libpayload/drivers/options.c

@@ -292,7 +292,7 @@ int get_option_as_string(const struct nvram_accessor *nvram, struct cb_cmos_opti
 			*dest = strdup((const char*)cmos_enum->text);
 			break;
 		default: /* fail */
-			return 1;
+			ret = 1;
 	}
 	free(raw);
 	return ret;