agent: clear match_like_matches_macro/vec_resize_to_zero warnings

This commit fix these warnings for Rust v1.47.0:

- match_like_matches_macro
- vec_resize_to_zero

Signed-off-by: bin liu <bin@hyper.sh>

src/agent/src/config.rs

@@ -225,10 +225,9 @@ fn get_bool_value(param: &str) -> Result<bool> {
     // first try to parse as bool value
     v.parse::<bool>().or_else(|_err1| {
         // then try to parse as integer value
-        v.parse::<u64>().or_else(|_err2| Ok(0)).map(|v| match v {
-            0 => false,
-            _ => true,
-        })
+        v.parse::<u64>()
+            .or_else(|_err2| Ok(0))
+            .map(|v| !matches!(v, 0))
     })
 }
 

src/agent/src/rpc.rs

@@ -1203,7 +1203,7 @@ impl protocols::agent_ttrpc::AgentService for agentService {
         drop(sandbox);
 
         match event_rx.recv() {
-            Err(err) => return Err(ttrpc_error(ttrpc::Code::INTERNAL, err.to_string())),
+            Err(err) => Err(ttrpc_error(ttrpc::Code::INTERNAL, err.to_string())),
             Ok(container_id) => {
                 info!(sl!(), "get_oom_event return {}", &container_id);
                 let mut resp = OOMEvent::new();
@@ -1327,7 +1327,7 @@ fn read_stream(fd: RawFd, l: usize) -> Result<Vec<u8>> {
         }
         Err(e) => match e {
             nix::Error::Sys(errno) => match errno {
-                Errno::EAGAIN => v.resize(0, 0),
+                Errno::EAGAIN => v.clear(),
                 _ => return Err(anyhow!(nix::Error::Sys(errno))),
             },
             _ => return Err(anyhow!("read error")),