output/http: log content-type like other headers

Ticket: 8056

Avoid stack allocation.
Do not handle null and ; especially

(cherry picked from commit b8411fcc8d)

src/output-json-http.c

@@ -237,13 +237,12 @@ static void EveHttpLogJSONBasic(JsonBuilder *js, htp_tx_t *tx)
     if (tx->response_headers != NULL) {
         htp_header_t *h_content_type = htp_table_get_c(tx->response_headers, "content-type");
         if (h_content_type != NULL) {
-            const size_t size = bstr_len(h_content_type->value) * 2 + 1;
-            char string[size];
-            BytesToStringBuffer(bstr_ptr(h_content_type->value), bstr_len(h_content_type->value), string, size);
-            char *p = strchr(string, ';');
+            uint32_t len = (uint32_t)bstr_len(h_content_type->value);
+            const uint8_t *p = memchr(bstr_ptr(h_content_type->value), ';', len);
             if (p != NULL)
-                *p = '\0';
-            jb_set_string(js, "http_content_type", string);
+                len = (uint32_t)(p - bstr_ptr(h_content_type->value));
+            jb_set_string_from_bytes(
+                    js, "http_content_type", bstr_ptr(h_content_type->value), len);
         }
         htp_header_t *h_content_range = htp_table_get_c(tx->response_headers, "content-range");
         if (h_content_range != NULL) {