[Minor] Use unsigned char for ascii checks

diff --git a/src/plugins/chartable.cxx b/src/plugins/chartable.cxx
index 6e3fd9b101cc9bcbfc8990ab953f69035a0f4163..a78e7a1a54bf85aeb744959efc21af4c71b5f1bf 100644 (file)
--- a/src/plugins/chartable.cxx
+++ b/src/plugins/chartable.cxx
@@ -494,7 +494,7 @@ rspamd_chartable_process_word_ascii(struct rspamd_task *task,
                got_unknown,
        } state = start_process;
 
-       const auto *p = w->normalized.begin;
+       const auto *p = (const unsigned char *)w->normalized.begin;
        const auto *end = p + w->normalized.len;
        last_sc = non_ascii;