Fix test

Author: newpavlov

tests/pass/shims/fs.rs

@@ -317,12 +317,12 @@ fn test_pread_pwrite() {
     f.write_all(b"hello world").unwrap();
 
     let mut buf1 = [0u8; 3];
-    f.seek(SeekFrom::Start(5));
+    f.seek(SeekFrom::Start(5)).unwrap();
 
     // Check that we get expected result after seek
     f.read_exact(&mut buf1).unwrap();
     assert_eq!(&buf1, b" wo");
-    f.seek(SeekFrom::Start(5));
+    f.seek(SeekFrom::Start(5)).unwrap();
 
     f.read_exact_at(&mut buf1, 2).unwrap();
     assert_eq!(&buf1, b"llo");
@@ -332,7 +332,7 @@ fn test_pread_pwrite() {
     // Ensure that cursor position is not changed
     f.read_exact(&mut buf1).unwrap();
     assert_eq!(&buf1, b" wo");
-    f.seek(SeekFrom::Start(5));
+    f.seek(SeekFrom::Start(5)).unwrap();
 
     f.write_all_at(b" mo", 6).unwrap();