virtio-queue: fix clippy::needless-lifetimes lint

Remove explicitly named lifetimes that can be elided by the compiler to
silence clippy lint.

Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>

Author: epilys

virtio-queue/src/descriptor_utils.rs

@@ -232,7 +232,7 @@ impl<'a, B: BitmapSlice> Reader<'a, B> {
     }
 }
 
-impl<'a, B: BitmapSlice> io::Read for Reader<'a, B> {
+impl<B: BitmapSlice> io::Read for Reader<'_, B> {
     fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
         self.buffer.consume(buf.len(), |bufs| {
             let mut rem = buf;
@@ -333,7 +333,7 @@ impl<'a, B: BitmapSlice> Writer<'a, B> {
     }
 }
 
-impl<'a, B: BitmapSlice> io::Write for Writer<'a, B> {
+impl<B: BitmapSlice> io::Write for Writer<'_, B> {
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
         self.buffer.consume(buf.len(), |bufs| {
             let mut rem = buf;

virtio-queue/src/queue.rs

@@ -730,7 +730,7 @@ where
     }
 }
 
-impl<'b, M> Iterator for AvailIter<'b, M>
+impl<M> Iterator for AvailIter<'_, M>
 where
     M: Clone + Deref,
     M::Target: GuestMemory,