[win32] call free() and not scaled_font_destroy() if scaled init fails

If scaled_font_destroy() is called, a deadlock can result; there's no
reason to call destroy since the initialization failed (and, indeed,
it might not be valid to do so anyway).

src/cairo-win32-font.c

@@ -308,7 +308,7 @@ _win32_scaled_font_create (LOGFONTW                   *logfont,
 	status = _cairo_win32_scaled_font_set_metrics (f);
 
     if (status) {
-	cairo_scaled_font_destroy (&f->base);
+	free (f);
 	return NULL;
     }