misc: Elide needless lifetimes

As clippy of rust-toolchain version 1.83.0-beta.1 suggests, elide
needless lifetimes to `'_`.

Signed-off-by: Ruoqing He <heruoqing@iscas.ac.cn>

net_util/src/queue_pair.rs

@@ -320,7 +320,7 @@ impl IovecBuffer {
 
 struct IovecBufferBorrowed<'a>(&'a mut Vec<libc::iovec>);
 
-impl<'a> std::ops::Deref for IovecBufferBorrowed<'a> {
+impl std::ops::Deref for IovecBufferBorrowed<'_> {
     type Target = Vec<libc::iovec>;
 
     fn deref(&self) -> &Self::Target {
@@ -328,7 +328,7 @@ impl<'a> std::ops::Deref for IovecBufferBorrowed<'a> {
     }
 }
 
-impl<'a> std::ops::DerefMut for IovecBufferBorrowed<'a> {
+impl std::ops::DerefMut for IovecBufferBorrowed<'_> {
     fn deref_mut(&mut self) -> &mut Self::Target {
         self.0
     }

pci/src/lib.rs

@@ -62,7 +62,7 @@ pub struct PciBdf(u32);
 
 struct PciBdfVisitor;
 
-impl<'de> Visitor<'de> for PciBdfVisitor {
+impl Visitor<'_> for PciBdfVisitor {
     type Value = PciBdf;
 
     fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {

src/bin/ch-remote.rs

@@ -258,7 +258,7 @@ impl<'a> DBusApi1ProxyBlocking<'a> {
     }
 }
 
-impl<'a> TargetApi<'a> {
+impl TargetApi<'_> {
     fn do_command(&mut self, matches: &ArgMatches) -> ApiResult {
         match self {
             Self::HttpApi(api_socket, _) => rest_api_do_command(matches, api_socket),

virtio-devices/src/vsock/mod.rs

@@ -349,7 +349,7 @@ mod tests {
         pub guest_evvq: GuestQ<'a>,
     }
 
-    impl<'a> EpollHandlerContext<'a> {
+    impl EpollHandlerContext<'_> {
         pub fn signal_txq_event(&mut self) {
             self.handler.queue_evts[1].write(1).unwrap();
             let events = epoll::Events::EPOLLIN;

vmm/src/device_tree.rs

@@ -145,7 +145,7 @@ impl<'a> Iterator for BftIter<'a> {
     }
 }
 
-impl<'a> DoubleEndedIterator for BftIter<'a> {
+impl DoubleEndedIterator for BftIter<'_> {
     fn next_back(&mut self) -> Option<Self::Item> {
         self.nodes.pop()
     }