Merge branch 'bugfix/fix_static_check_error_mr_4.3' into 'release/v4.3'

Fix the high-impact issues from the code analysis report from customer.

See merge request espressif/esp-idf!16045

components/bt/host/bluedroid/stack/l2cap/l2c_api.c

@@ -1976,6 +1976,9 @@ BOOLEAN L2CA_SetFixedChannelTout (BD_ADDR rem_bda, UINT16 fixed_cid, UINT16 idle
         transport = BT_TRANSPORT_LE;
     }
 #endif
+    if (fixed_cid<L2CAP_FIRST_FIXED_CHNL) {
+        return (FALSE);
+    }
 
     /* Is a fixed channel connected to the remote BDA ?*/
     p_lcb = l2cu_find_lcb_by_bd_addr (rem_bda, transport);