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/hermit/stdio.rs b/src/libstd/sys/hermit/stdio.rs
index 9505f02fda8..2eb011ccb39 100644
--- a/src/libstd/sys/hermit/stdio.rs
+++ b/src/libstd/sys/hermit/stdio.rs
@@ -20,7 +20,6 @@ impl Stdin {
         //    .read(data)
         Ok(0)
     }
-
 }
 
 impl Stdout {
@@ -31,9 +30,7 @@ impl Stdout {
     pub fn write(&self, data: &[u8]) -> io::Result<usize> {
         let len;
 
-        unsafe {
-            len = abi::write(1, data.as_ptr() as *const u8, data.len())
-        }
+        unsafe { len = abi::write(1, data.as_ptr() as *const u8, data.len()) }
 
         if len < 0 {
             Err(io::Error::new(io::ErrorKind::Other, "Stdout is not able to print"))
@@ -45,9 +42,7 @@ impl Stdout {
     pub fn write_vectored(&self, data: &[IoSlice<'_>]) -> io::Result<usize> {
         let len;
 
-        unsafe {
-            len = abi::write(1, data.as_ptr() as *const u8, data.len())
-        }
+        unsafe { len = abi::write(1, data.as_ptr() as *const u8, data.len()) }
 
         if len < 0 {
             Err(io::Error::new(io::ErrorKind::Other, "Stdout is not able to print"))
@@ -69,9 +64,7 @@ impl Stderr {
     pub fn write(&self, data: &[u8]) -> io::Result<usize> {
         let len;
 
-        unsafe {
-            len = abi::write(2, data.as_ptr() as *const u8, data.len())
-        }
+        unsafe { len = abi::write(2, data.as_ptr() as *const u8, data.len()) }
 
         if len < 0 {
             Err(io::Error::new(io::ErrorKind::Other, "Stderr is not able to print"))
@@ -83,9 +76,7 @@ impl Stderr {
     pub fn write_vectored(&self, data: &[IoSlice<'_>]) -> io::Result<usize> {
         let len;
 
-        unsafe {
-            len = abi::write(2, data.as_ptr() as *const u8, data.len())
-        }
+        unsafe { len = abi::write(2, data.as_ptr() as *const u8, data.len()) }
 
         if len < 0 {
             Err(io::Error::new(io::ErrorKind::Other, "Stderr is not able to print"))