Fix path_open_read_without_rights test

Fixes `path_open_read_without_rights` test making the CI green again.

crates/test-programs/wasi-tests/src/bin/path_open_read_without_rights.rs

@@ -1,6 +1,6 @@
 use std::{env, process};
 use wasi_tests::open_scratch_directory;
-use wasi_tests::{drop_rights, fd_get_rights, create_file};
+use wasi_tests::{create_file, drop_rights, fd_get_rights};
 
 const TEST_FILENAME: &'static str = "file";
 
@@ -27,8 +27,13 @@ unsafe fn try_read_file(dir_fd: wasi::Fd) {
     };
     // Since we no longer have the right to fd_read, trying to read a file
     // should be an error.
-    let err = wasi::fd_read(fd, &[iovec]).expect_err("reading bytes from file should fail");
-    assert_eq!(err, wasi::ERRNO_NOTCAPABLE, "the errno should be ENOTCAPABLE");
+    assert_eq!(
+        wasi::fd_read(fd, &[iovec])
+            .expect_err("reading bytes from file should fail")
+            .raw_error(),
+        wasi::ERRNO_NOTCAPABLE,
+        "the errno should be ENOTCAPABLE"
+    );
 }
 
 unsafe fn test_read_rights(dir_fd: wasi::Fd) {