Prefer elided lifetimes

These were flagged by `cargo clippy`:

    warning: explicit lifetimes given in parameter types where they
             could be elided (or replaced with `'_` if needed by type
             declaration)

src/storage/assembler.rs

@@ -243,7 +243,7 @@ impl Assembler {
     /// |--- 100 ---|--- 200 ---|--- 100 ---|
     ///
     /// An offset of 1500 would return the ranges: ``(1500, 1600), (1800, 1900)``
-    pub fn iter_data<'a>(&'a self, first_offset: usize) -> AssemblerIter<'a> {
+    pub fn iter_data(&self, first_offset: usize) -> AssemblerIter {
         AssemblerIter::new(self, first_offset)
     }
 }

src/storage/ring_buffer.rs

@@ -190,7 +190,7 @@ impl<'a, T: 'a> RingBuffer<'a, T> {
     /// This function may return a slice smaller than the given size
     /// if the free space in the buffer is not contiguous.
     // #[must_use]
-    pub fn enqueue_many<'b>(&'b mut self, size: usize) -> &'b mut [T] {
+    pub fn enqueue_many(&mut self, size: usize) -> &mut [T] {
         self.enqueue_many_with(|buf| {
             let size = cmp::min(size, buf.len());
             (size, &mut buf[..size])
@@ -242,7 +242,7 @@ impl<'a, T: 'a> RingBuffer<'a, T> {
     /// This function may return a slice smaller than the given size
     /// if the allocated space in the buffer is not contiguous.
     // #[must_use]
-    pub fn dequeue_many<'b>(&'b mut self, size: usize) -> &'b mut [T] {
+    pub fn dequeue_many(&mut self, size: usize) -> &mut [T] {
         self.dequeue_many_with(|buf| {
             let size = cmp::min(size, buf.len());
             (size, &mut buf[..size])

src/wire/tcp.rs

@@ -307,9 +307,7 @@ impl<T: AsRef<[u8]>> Packet<T> {
     /// Return the selective acknowledgement ranges, if any. If there are none in the packet, an
     /// array of ``None`` values will be returned.
     ///
-    pub fn selective_ack_ranges<'s>(
-        &'s self
-    ) -> Result<[Option<(u32, u32)>; 3]> {
+    pub fn selective_ack_ranges(&self) -> Result<[Option<(u32, u32)>; 3]> {
         let data = self.buffer.as_ref();
         let mut options = &data[field::OPTIONS(self.header_len())];
         while !options.is_empty() {