Remove trailing whitespace

I had one job...
rust-lang · bors · Aug 3, 2019 · Jul 30, 2019 · Jul 30, 2019 · Jul 30, 2019
commit 13b4afe4baf0080cb1392d8e4009fee31c4b95ea
diff --git a/src/libcore/mem/mod.rs b/src/libcore/mem/mod.rs
@@ -417,7 +417,7 @@ pub const fn needs_drop<T>() -> bool {
 /// Returns the value of type `T` represented by the all-zeros bit-pattern.
 ///
 /// This means that, for example, the padding byte in `(u8, u16)` is not
-/// necessarily zeroed. 
+/// necessarily zeroed.
 ///
 /// There is no guarantee that an all-zero byte-pattern represents a valid value of
 /// some type `T`. For example, the all-zero byte-pattern is not a valid value