New gdispImageInit() call to initialise a gdispImage structure

Use in gwinImage

src/gdisp/image.c

@@ -130,6 +130,10 @@ gdispImageError
 	}
 #endif
 
+void gdispImageInit(gdispImage *img) {
+	img->type = GDISP_IMAGE_TYPE_UNKNOWN;
+}
+
 gdispImageError gdispImageOpenGFile(gdispImage *img, GFILE *f) {
 	gdispImageError err;
 

src/gdisp/image.h

@@ -130,6 +130,14 @@ extern "C" {
 		#define gdispImageSetSimulFileReader(img, fname)	gdispImageSetFileReader(img, fname)
 	#endif
 
+	/**
+	 * @brief	Initialise a gdispImage object
+	 *
+	 * @param[in] img  		The image structure to initialise
+	 *
+	 */
+	void gdispImageInit(gdispImage *img);
+
 	/**
 	 * @brief	Open an image using an open GFILE and get it ready for drawing
 	 * @details	Determine the image format and get ready to decode the first image frame

src/gwin/gimage.c

@@ -127,8 +127,7 @@ GHandle gwinGImageCreate(GDisplay *g, GImageObject *gobj, GWindowInit *pInit) {
 		return 0;
 
 	// Ensure the gdispImageIsOpen() gives valid results
-	gobj->image.type = 0;
-	gobj->image.fns = 0;
+	gdispImageInit(&gobj->image);
 
 	// Initialise the timer
 	#if GWIN_NEED_IMAGE_ANIMATION