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, 3 insertions, 7 deletions

diff --git a/src/libstd/sys/vxworks/alloc.rs b/src/libstd/sys/vxworks/alloc.rs
index e0c560b9214..97a191d7232 100644
--- a/src/libstd/sys/vxworks/alloc.rs
+++ b/src/libstd/sys/vxworks/alloc.rs
@@ -1,6 +1,6 @@
-use crate::ptr;
-use crate::sys_common::alloc::{MIN_ALIGN, realloc_fallback};
 use crate::alloc::{GlobalAlloc, Layout, System};
+use crate::ptr;
+use crate::sys_common::alloc::{realloc_fallback, MIN_ALIGN};
 
 #[stable(feature = "alloc_system_type", since = "1.28.0")]
 unsafe impl GlobalAlloc for System {
@@ -45,9 +45,5 @@ unsafe impl GlobalAlloc for System {
 unsafe fn aligned_malloc(layout: &Layout) -> *mut u8 {
     let mut out = ptr::null_mut();
     let ret = libc::posix_memalign(&mut out, layout.align(), layout.size());
-    if ret != 0 {
-        ptr::null_mut()
-    } else {
-        out as *mut u8
-    }
+    if ret != 0 { ptr::null_mut() } else { out as *mut u8 }
 }