Minimise the use of the unsafe block inside pipe function

Some of the operations inside the pipe function are safe and should
not be included inside an unsafe block.

Signed-off-by: Costin-Robert Sin <[email protected]>

Author: costinsin

src/unistd.rs

@@ -1118,15 +1118,13 @@ pub fn lseek64(fd: RawFd, offset: libc::off64_t, whence: Whence) -> Result<libc:
 ///
 /// See also [pipe(2)](https://pubs.opengroup.org/onlinepubs/9699919799/functions/pipe.html)
 pub fn pipe() -> std::result::Result<(RawFd, RawFd), Error> {
-    unsafe {
-        let mut fds = mem::MaybeUninit::<[c_int; 2]>::uninit();
+    let mut fds = mem::MaybeUninit::<[c_int; 2]>::uninit();
 
-        let res = libc::pipe(fds.as_mut_ptr() as *mut c_int);
+    let res = unsafe { libc::pipe(fds.as_mut_ptr() as *mut c_int) };
 
-        Error::result(res)?;
+    Error::result(res)?;
 
-        Ok((fds.assume_init()[0], fds.assume_init()[1]))
-    }
+    unsafe { Ok((fds.assume_init()[0], fds.assume_init()[1])) }
 }
 
 feature! {