std.Io.Threaded: stop checking bytes read with END_OF_FILE

lib/std/Io/Threaded.zig

@@ -8816,9 +8816,10 @@ fn fileReadStreamingPosix(file: File, data: []const []u8) File.ReadStreamingErro
 fn fileReadStreamingWindows(file: File, data: []const []u8) File.ReadStreamingError!usize {
     var io_status_block: windows.IO_STATUS_BLOCK = .{
         .u = .{ .Status = .PENDING },
-        .Information = 0,
+        .Information = undefined,
     };
     try ntReadFile(file.handle, data, &noopApc, null, &io_status_block);
+
     while (@atomicLoad(windows.NTSTATUS, &io_status_block.u.Status, .acquire) == .PENDING) {
         // Once we get here we must not return from the function until the
         // operation completes, thereby releasing reference to io_status_block.
@@ -8842,10 +8843,7 @@ fn ntReadFileResult(io_status_block: *const windows.IO_STATUS_BLOCK) !usize {
         .PENDING => unreachable,
         .CANCELLED => unreachable,
         .SUCCESS => return io_status_block.Information,
-        .END_OF_FILE, .PIPE_BROKEN => {
-            if (io_status_block.Information == 0) return error.EndOfStream;
-            return io_status_block.Information;
-        },
+        .END_OF_FILE, .PIPE_BROKEN => return error.EndOfStream,
         .INVALID_DEVICE_REQUEST => return error.IsDir,
         .LOCK_NOT_GRANTED => return error.LockViolation,
         .ACCESS_DENIED => return error.AccessDenied,