rollup merge of #21444: petrochenkov/null

Conflicts:
	src/libstd/sync/mpsc/select.rs

1 files changed, 1 insertions, 1 deletions

diff --git a/src/liballoc/heap.rs b/src/liballoc/heap.rs
index bd5b43b782e..44be0503bc2 100644
--- a/src/liballoc/heap.rs
+++ b/src/liballoc/heap.rs
@@ -280,7 +280,7 @@ mod imp {
         if align <= MIN_ALIGN {
             libc::malloc(size as libc::size_t) as *mut u8
         } else {
-            let mut out = 0 as *mut libc::c_void;
+            let mut out = ptr::null();
             let ret = posix_memalign(&mut out,
                                      align as libc::size_t,
                                      size as libc::size_t);