fixed type issue from recent merge

go.mod

@@ -1,3 +1,5 @@
 module github.com/creack/pty/v2
 
 go 1.18
+
+require golang.org/x/sys v0.13.0

go.sum

@@ -1,2 +1,2 @@
-golang.org/x/sys v0.0.0-20220721230656-c6bc011c0c49 h1:TMjZDarEwf621XDryfitp/8awEhiZNiwgphKlTMGRIg=
-golang.org/x/sys v0.0.0-20220721230656-c6bc011c0c49/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
+golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

winsize_unix.go

@@ -4,22 +4,23 @@
 package pty
 
 import (
+	"os"
 	"syscall"
 	"unsafe"
 )
 
 // Setsize resizes t to s.
 func Setsize(t FdHolder, ws *Winsize) error {
 	//nolint:gosec // Expected unsafe pointer for Syscall call.
-	return ioctl(t, syscall.TIOCSWINSZ, uintptr(unsafe.Pointer(ws)))
+	return ioctl(t.(*os.File), syscall.TIOCSWINSZ, uintptr(unsafe.Pointer(ws)))
 }
 
 // GetsizeFull returns the full terminal size description.
 func GetsizeFull(t FdHolder) (size *Winsize, err error) {
 	var ws Winsize
 
 	//nolint:gosec // Expected unsafe pointer for Syscall call.
-	if err := ioctl(t, syscall.TIOCGWINSZ, uintptr(unsafe.Pointer(&ws))); err != nil {
+	if err := ioctl(t.(*os.File), syscall.TIOCGWINSZ, uintptr(unsafe.Pointer(&ws))); err != nil {
 		return nil, err
 	}
 	return &ws, nil