std: Use ctypes::c_int in path_is_dir

src/libstd/fs.rs

@@ -121,10 +121,7 @@ Indicates whether a path represents a directory.
 */
 fn path_is_dir(p: path) -> bool {
     ret str::as_buf(p, {|buf|
-        // FIXME: instead of 0i32, ctypes::c_int
-        // should be used here. but it triggers
-        // a segv fault. Issue 1558
-        rustrt::rust_path_is_dir(buf) != 0i32
+        rustrt::rust_path_is_dir(buf) != 0 as ctypes::c_int
     });
 }