style(lib): use just std instead of ::std in paths (#2101)

src/common/mod.rs

@@ -1,8 +1,8 @@
 macro_rules! ready {
     ($e:expr) => {
         match $e {
-            ::std::task::Poll::Ready(v) => v,
-            ::std::task::Poll::Pending => return ::std::task::Poll::Pending,
+            std::task::Poll::Ready(v) => v,
+            std::task::Poll::Pending => return std::task::Poll::Pending,
         }
     };
 }