trivial changes

Signed-off-by: fufesou <shuanglongchen@yeah.net>

src/flutter_ffi.rs

@@ -10,6 +10,7 @@ use crate::{
 };
 use flutter_rust_bridge::{StreamSink, SyncReturn};
 use hbb_common::{
+    allow_err,
     config::{self, LocalConfig, PeerConfig, PeerInfoSerde, ONLINE},
     fs, log,
     message_proto::KeyboardMode,

src/plugin/errno.rs

@@ -19,7 +19,7 @@ pub const ERR_CALL_INVALID_ARGS: i32 = 10301;
 pub const ERR_PEER_ID_MISMATCH: i32 = 10302;
 
 // ======================================================
-// errors that must be handled by plugin
+// errors that should be handled by the plugin
 
 pub const ERR_PLUGIN_HANDLE_BASE: i32 = 20000;