Merge #2033

2033: remove unused mut from two variable declarations in sys/socket/mod.rs r=asomers a=inglorion

This addresses diagnostics like:

  error: variable does not need to be mutable
      --> src/sys/socket/mod.rs:1537:13
       |
  1537 |         let mut p = &mut mmsghdr.msg_hdr;

Co-authored-by: Bob Haarman <inglorion@google.com>

Author: bors[bot]

src/sys/socket/mod.rs

@@ -1534,7 +1534,7 @@ pub fn sendmmsg<'a, XS, AS, C, I, S>(
 
 
     for (i, ((slice, addr), mmsghdr)) in slices.into_iter().zip(addrs.as_ref()).zip(data.items.iter_mut() ).enumerate() {
-        let mut p = &mut mmsghdr.msg_hdr;
+        let p = &mut mmsghdr.msg_hdr;
         p.msg_iov = slice.as_ref().as_ptr() as *mut libc::iovec;
         p.msg_iovlen = slice.as_ref().len() as _;
 
@@ -1687,7 +1687,7 @@ where
 {
     let mut count = 0;
     for (i, (slice, mmsghdr)) in slices.into_iter().zip(data.items.iter_mut()).enumerate() {
-        let mut p = &mut mmsghdr.msg_hdr;
+        let p = &mut mmsghdr.msg_hdr;
         p.msg_iov = slice.as_ref().as_ptr() as *mut libc::iovec;
         p.msg_iovlen = slice.as_ref().len() as _;
         count = i + 1;