Refactor imports and adjust MSG_NOSIGNAL usage

Author: mlowicki

Diff for: library/std/src/os/unix/net/stream.rs

@@ -1,3 +1,18 @@
+#[cfg(any(
+    target_os = "linux",
+    target_os = "android",
+    target_os = "dragonfly",
+    target_os = "freebsd",
+    target_os = "openbsd",
+    target_os = "netbsd",
+    target_os = "solaris",
+    target_os = "illumos",
+    target_os = "haiku",
+    target_os = "nto",
+    target_os = "cygwin"
+))]
+use libc::MSG_NOSIGNAL;
+
 use super::{SocketAddr, sockaddr_un};
 #[cfg(any(doc, target_os = "android", target_os = "linux"))]
 use super::{SocketAncillary, recv_vectored_with_ancillary_from, send_vectored_with_ancillary_to};
@@ -13,9 +28,7 @@ use super::{SocketAncillary, recv_vectored_with_ancillary_from, send_vectored_wi
     target_os = "cygwin"
 ))]
 use super::{UCred, peer_cred};
-use crate::cmp;
 use crate::ffi::c_void;
-use crate::fmt;
 use crate::io::{self, IoSlice, IoSliceMut};
 use crate::net::Shutdown;
 use crate::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd};
@@ -25,20 +38,8 @@ use crate::sys::cvt;
 use crate::sys::net::{Socket, wrlen_t};
 use crate::sys_common::{AsInner, FromInner};
 use crate::time::Duration;
-#[cfg(any(
-    target_os = "linux",
-    target_os = "android",
-    target_os = "dragonfly",
-    target_os = "freebsd",
-    target_os = "openbsd",
-    target_os = "netbsd",
-    target_os = "solaris",
-    target_os = "illumos",
-    target_os = "haiku",
-    target_os = "nto",
-    target_os = "cygwin"
-))]
-use libc::MSG_NOSIGNAL;
+use crate::{cmp, fmt};
+
 #[cfg(not(any(
     target_os = "linux",
     target_os = "android",
@@ -666,8 +667,8 @@ impl<'a> io::Write for &'a UnixStream {
         let len = cmp::min(buf.len(), <wrlen_t>::MAX as usize) as wrlen_t; 
         let ret = cvt(unsafe { 
             libc::send(self.0.as_raw(), buf.as_ptr() as *const c_void, len, MSG_NOSIGNAL) 
-         })?; 
-         Ok(ret as usize) 
+        })?; 
+        Ok(ret as usize) 
     }
 
     fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {