Change errdefers in create()/init() functions

They should use gpa.destroy() instead of foo.destroy() because (most) of
them have fields that may not be initialized by the first error, so
the foo.destroy() could crash.

src/Bar.zig

@@ -78,6 +78,7 @@ pub fn initSurface(bar: *Bar) !void {
 
 pub fn deinit(bar: *Bar) void {
     bar.configured = false;
+    bar.timezone.deinit();
     if (bar.wl_surface) |wl_surface| {
         wl_surface.destroy();
     }