Format libstd/sys with rustfmt

This commit applies rustfmt with rust-lang/rust's default settings to
files in src/libstd/sys *that are not involved in any currently open PR*
to minimize merge conflicts. THe list of files involved in open PRs was
determined by querying GitHub's GraphQL API with this script:
https://gist.github.com/dtolnay/aa9c34993dc051a4f344d1b10e4487e8

With the list of files from the script in outstanding_files, the
relevant commands were:

    $ find src/libstd/sys -name '*.rs' \
        | xargs rustfmt --edition=2018 --unstable-features --skip-children
    $ rg libstd/sys outstanding_files | xargs git checkout --

Repeating this process several months apart should get us coverage of
most of the rest of the files.

To confirm no funny business:

    $ git checkout $THIS_COMMIT^
    $ git show --pretty= --name-only $THIS_COMMIT \
        | xargs rustfmt --edition=2018 --unstable-features --skip-children
    $ git diff $THIS_COMMIT  # there should be no difference

1 files changed, 4 insertions, 13 deletions

diff --git a/src/libstd/sys/windows/io.rs b/src/libstd/sys/windows/io.rs
index e44dcbe164d..9d8018fd5e8 100644
--- a/src/libstd/sys/windows/io.rs
+++ b/src/libstd/sys/windows/io.rs
@@ -35,9 +35,7 @@ impl<'a> IoSlice<'a> {
 
     #[inline]
     pub fn as_slice(&self) -> &[u8] {
-        unsafe {
-            slice::from_raw_parts(self.vec.buf as *mut u8, self.vec.len as usize)
-        }
+        unsafe { slice::from_raw_parts(self.vec.buf as *mut u8, self.vec.len as usize) }
     }
 }
 
@@ -52,10 +50,7 @@ impl<'a> IoSliceMut<'a> {
     pub fn new(buf: &'a mut [u8]) -> IoSliceMut<'a> {
         assert!(buf.len() <= c::ULONG::max_value() as usize);
         IoSliceMut {
-            vec: c::WSABUF {
-                len: buf.len() as c::ULONG,
-                buf: buf.as_mut_ptr() as *mut c::CHAR,
-            },
+            vec: c::WSABUF { len: buf.len() as c::ULONG, buf: buf.as_mut_ptr() as *mut c::CHAR },
             _p: PhantomData,
         }
     }
@@ -74,15 +69,11 @@ impl<'a> IoSliceMut<'a> {
 
     #[inline]
     pub fn as_slice(&self) -> &[u8] {
-        unsafe {
-            slice::from_raw_parts(self.vec.buf as *mut u8, self.vec.len as usize)
-        }
+        unsafe { slice::from_raw_parts(self.vec.buf as *mut u8, self.vec.len as usize) }
     }
 
     #[inline]
     pub fn as_mut_slice(&mut self) -> &mut [u8] {
-        unsafe {
-            slice::from_raw_parts_mut(self.vec.buf as *mut u8, self.vec.len as usize)
-        }
+        unsafe { slice::from_raw_parts_mut(self.vec.buf as *mut u8, self.vec.len as usize) }
     }
 }