Replace .unwrap() with ? in std::os::unix::net

Author: linkmauve

src/libstd/sys/unix/ext/mod.rs

@@ -16,7 +16,7 @@
 //! use std::os::unix::prelude::*;
 //!
 //! fn main() {
-//!     let f = File::create("foo.txt").unwrap();
+//!     let f = File::create("foo.txt")?;
 //!     let fd = f.as_raw_fd();
 //!
 //!     // use fd with native unix bindings