fix clippy assertions_on_result_states

https://rust-lang.github.io/rust-clippy/master/index.html#assertions_on_result_states

1 files changed, 2 insertions, 2 deletions

diff --git a/test/sys/test_epoll.rs b/test/sys/test_epoll.rs
index fafbd749..91569159 100644
--- a/test/sys/test_epoll.rs
+++ b/test/sys/test_epoll.rs
@@ -6,11 +6,11 @@ use nix::sys::epoll::{EpollCreateFlags, EpollEvent, EpollFlags, EpollOp};
 pub fn test_epoll_errno() {
     let efd = epoll_create1(EpollCreateFlags::empty()).unwrap();
     let result = epoll_ctl(efd, EpollOp::EpollCtlDel, 1, None);
-    assert!(result.is_err());
+    result.expect_err("assertion failed");
     assert_eq!(result.unwrap_err(), Errno::ENOENT);
 
     let result = epoll_ctl(efd, EpollOp::EpollCtlAdd, 1, None);
-    assert!(result.is_err());
+    result.expect_err("assertion failed");
     assert_eq!(result.unwrap_err(), Errno::EINVAL);
 }