panvk: clear dangling pointers

panvk: clear dangling pointers

Fixes:
```
[829/1646] Compiling C object src/panfrost/vulkan/libpanvk_v6.a.p/panvk_vX_meta_clear.c.o
In function 'panvk_meta_clear_zs_img',
    inlined from 'panvk_v6_CmdClearDepthStencilImage' at ../src/panfrost/vulkan/panvk_vX_meta_clear.c:457:7:
../src/panfrost/vulkan/panvk_vX_meta_clear.c:415:26: warning: storing the address of local variable 'view' in '((struct pan_fb_info *)((char *)commandBuffer + 144))[23].zs.view.zs' [-Wdangling-pointer=]
  415 |       fbinfo->zs.view.zs = &view;
      |       ~~~~~~~~~~~~~~~~~~~^~~~~~~
../src/panfrost/vulkan/panvk_vX_meta_clear.c: In function 'panvk_v6_CmdClearDepthStencilImage':
../src/panfrost/vulkan/panvk_vX_meta_clear.c:393:26: note: 'view' declared here
  393 |    struct pan_image_view view = {
      |                          ^~~~
../src/panfrost/vulkan/panvk_vX_meta_clear.c:393:26: note: 'commandBuffer' declared here
[844/1646] Compiling C object src/panfrost/vulkan/libpanvk_v7.a.p/panvk_vX_meta_clear.c.o
In function 'panvk_meta_clear_zs_img',
    inlined from 'panvk_v7_CmdClearDepthStencilImage' at ../src/panfrost/vulkan/panvk_vX_meta_clear.c:457:7:
../src/panfrost/vulkan/panvk_vX_meta_clear.c:415:26: warning: storing the address of local variable 'view' in '((struct pan_fb_info *)((char *)commandBuffer + 144))[23].zs.view.zs' [-Wdangling-pointer=]
  415 |       fbinfo->zs.view.zs = &view;
      |       ~~~~~~~~~~~~~~~~~~~^~~~~~~
../src/panfrost/vulkan/panvk_vX_meta_clear.c: In function 'panvk_v7_CmdClearDepthStencilImage':
../src/panfrost/vulkan/panvk_vX_meta_clear.c:393:26: note: 'view' declared here
  393 |    struct pan_image_view view = {
      |                          ^~~~
../src/panfrost/vulkan/panvk_vX_meta_clear.c:393:26: note: 'commandBuffer' declared here
```

Cc: mesa-stable
Suggested-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: David Heidelberg <david.heidelberg@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22829>