[GTK] Insufficient pointer validation when creating new Cairo surface

[ptziegler]

Describe the bug

When creating a Cairo surface, an SWT error is thrown if a null pointer is returned.

eclipse.platform.swt/bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/graphics/Image.java

Lines 288 to 289 in 28bb9b4

	surface = Cairo.cairo_image_surface_create(format, dataWidth, dataHeight);
	if (surface == 0) SWT.error(SWT.ERROR_NO_HANDLES);

But per the documentation of this method:

This function always returns a valid pointer, but it will return a pointer to a "nil" surface if an error such as out of memory occurs. You can use cairo_surface_status() to check for this.

Note: The same is true for gdk_window_create_similar_surface

In short: This check should always succeed.

[ptziegler]

For example, calling new Image(display, Integer.MAX_VALUE, Integer.MAX_VALUE) should require ~13 exabyte of memory. In such a case, Cairo returns an CAIRO_STATUS_NO_MEMORY, but this is silently ignored by SWT.