Use cvt from the cvt crate in winx

winx/src/file.rs

@@ -1,5 +1,6 @@
 #![allow(non_camel_case_types)]
 use crate::{winerror, Result};
+use cvt::cvt;
 use std::ffi::{c_void, OsString};
 use std::fs::File;
 use std::io;
@@ -380,15 +381,6 @@ pub fn get_file_path(file: &File) -> Result<OsString> {
     Ok(OsString::from_wide(written_bytes))
 }
 
-// Taken from Rust libstd, file libstd/sys/windows/fs.rs
-fn cvt(i: winapi::shared::minwindef::BOOL) -> io::Result<()> {
-    if i == 0 {
-        Err(io::Error::last_os_error())
-    } else {
-        Ok(())
-    }
-}
-
 pub fn get_fileinfo(file: &File) -> io::Result<fileapi::BY_HANDLE_FILE_INFORMATION> {
     use fileapi::{GetFileInformationByHandle, BY_HANDLE_FILE_INFORMATION};
     use std::mem;