rust/mqtt: fix clippy 1.77 warning

error: creating a mutable reference to mutable static is discouraged
   --> src/mqtt/mqtt.rs:752:23
    |
752 |     let max_msg_len = &mut MAX_MSG_LEN;
    |                       ^^^^^^^^^^^^^^^^ mutable reference to mutable static
    |
    = note: for more information, see issue #114447 <https://github.com/rust-lang/rust/issues/114447>
    = note: this will be a hard error in the 2024 edition
    = note: this mutable reference has lifetime `'static`, but if the static gets accessed (read or written) by any other means, or any other reference is created, then any further use of this mutable reference is Undefined Behavior

diff --git a/rust/src/mqtt/mqtt.rs b/rust/src/mqtt/mqtt.rs
index 8260251218bd0f22a2502b1192b0fb20a56428fe..35f3c6d459a8a9d7d6d7d4f75a589aadc0598924 100644 (file)
--- a/rust/src/mqtt/mqtt.rs
+++ b/rust/src/mqtt/mqtt.rs
@@ -749,8 +749,7 @@ export_state_data_get!(rs_mqtt_get_state_data, MQTTState);
 #[no_mangle]
 pub unsafe extern "C" fn rs_mqtt_register_parser(cfg_max_msg_len: u32) {
     let default_port = CString::new("[1883]").unwrap();
-    let max_msg_len = &mut MAX_MSG_LEN;
-    *max_msg_len = cfg_max_msg_len;
+    MAX_MSG_LEN = cfg_max_msg_len;
     let parser = RustParser {
         name: PARSER_NAME.as_ptr() as *const std::os::raw::c_char,
         default_port: default_port.as_ptr(),