email-json: free temporary 'to' string

src/output-json-email-common.c

@@ -126,6 +126,7 @@ static TmEcode JsonEmailLogJson(JsonEmailLogThread *aft, json_t *js, const Packe
                         //printf("got another addr: \"%s\"\n", p);
                         json_array_append_new(js_to, json_string(&p[strspn(p, " ")]));
                     }
+                    SCFree(to_line);
                     json_object_set_new(sjs, "to", js_to);
                 }
             }