Replace most instances of mem::uninitialized with mem::MaybeUninit

Only two instances remain:

* For the deprecated sys::socket::CmsgSpace::new.  We should probably
  just remove that method.

* For sys::termios::Termios::default_uninit.  This will require some
  more thought.

Fixes #1096

1 files changed, 5 insertions, 5 deletions

diff --git a/src/ucontext.rs b/src/ucontext.rs
index 5e10e7d1..1bcfdd9b 100644
--- a/src/ucontext.rs
+++ b/src/ucontext.rs
@@ -14,11 +14,11 @@ pub struct UContext {
 impl UContext {
     #[cfg(not(target_env = "musl"))]
     pub fn get() -> Result<UContext> {
-        let mut context: libc::ucontext_t = unsafe { mem::uninitialized() };
-        let res = unsafe {
-            libc::getcontext(&mut context as *mut libc::ucontext_t)
-        };
-        Errno::result(res).map(|_| UContext { context: context })
+        let mut context = mem::MaybeUninit::<libc::ucontext_t>::uninit();
+        let res = unsafe { libc::getcontext(context.as_mut_ptr()) };
+        Errno::result(res).map(|_| unsafe {
+            UContext { context: context.assume_init()}
+        })
     }
 
     #[cfg(not(target_env = "musl"))]