Fix: pass const string "%s" with variable string i.s.o. variable string directly

controller/ec/esc_mailbox.c

@@ -70,7 +70,7 @@ static void esc_error_handler_default(void *msg, size_t len)
 	for (i = 0; i < len; i++) {
 		pos += sprintf(msgstr + pos, " 0x%02x", msgb[i]);
 	}
-	log_send(LOG_T_ERROR, msgstr);
+	log_send(LOG_T_ERROR, "%s", msgstr);
 }
 
 struct esc_mailbox *esc_mailbox_create(struct ec_dgram_addr *node,