Fix data race error

Author: larrabee

Image.go

@@ -30,23 +30,22 @@ import "C"
 
 type Image struct {
 	p        *C.struct_liq_image
+	dataP    unsafe.Pointer
 	w, h     int
 	released bool
 }
 
 // Callers MUST call Release() on the returned object to free memory.
 func NewImage(attr *Attributes, rgba32data string, width, height int, gamma float64) (*Image, error) {
 	dataP := unsafe.Pointer(C.CString(rgba32data))
-	defer C.free(dataP)
-
 	pImg := C.liq_image_create_rgba(attr.p, dataP, C.int(width), C.int(height), C.double(gamma))
 	if pImg == nil {
 		return nil, errors.New("Failed to create image (invalid argument)")
 	}
 	return &Image{
-		p: pImg,
-		w: width,
-		//dataPointer: data,
+		p:        pImg,
+		w:        width,
+		dataP:    dataP,
 		h:        height,
 		released: false,
 	}, nil
@@ -55,6 +54,7 @@ func NewImage(attr *Attributes, rgba32data string, width, height int, gamma floa
 // Free memory. Callers must not use this object after Release has been called.
 func (this *Image) Release() {
 	C.liq_image_destroy(this.p)
+	C.free(this.dataP)
 	this.released = true
 }