panvk: do not leak bindings

There were nothing here cleaning this up.

CID: 1596490
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28856>

src/panfrost/vulkan/panvk_vX_descriptor_set_layout.c

@@ -77,6 +77,7 @@ panvk_per_arch(GetDescriptorSetLayoutSupport)(
          unreachable("Invalid descriptor type");
       }
    }
+   free(bindings);
 
    /* The maximum values apply to all sets attached to a pipeline since all
     * sets descriptors have to be merged in a single array.