anv: fix descriptor pool internal size allocation

The size of the pool is slightly smaller than the size of the
structure containing the whole pool. We need to take that into account
on when setting up the internals.

Fixes a crash due to out of bound memory access in:
   dEQP-VK.api.descriptor_pool.out_of_pool_memory

v2: Drop debug traces (Lionel)

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Cc: "17.0 13.0" <mesa-stable@lists.freedesktop.org>
(cherry picked from commit c3421106ec332bf3a943ccf9447edf00dc7f3618)
diff --git a/src/intel/vulkan/anv_descriptor_set.c b/src/intel/vulkan/anv_descriptor_set.c
index 2926e7a..5c518d7 100644
--- a/src/intel/vulkan/anv_descriptor_set.c
+++ b/src/intel/vulkan/anv_descriptor_set.c
@@ -329,18 +329,18 @@
       }
    }
 
-   const size_t size =
-      sizeof(*pool) +
+   const size_t pool_size =
       pCreateInfo->maxSets * sizeof(struct anv_descriptor_set) +
       descriptor_count * sizeof(struct anv_descriptor) +
       buffer_count * sizeof(struct anv_buffer_view);
+   const size_t total_size = sizeof(*pool) + pool_size;
 
-   pool = vk_alloc2(&device->alloc, pAllocator, size, 8,
+   pool = vk_alloc2(&device->alloc, pAllocator, total_size, 8,
                      VK_SYSTEM_ALLOCATION_SCOPE_OBJECT);
    if (!pool)
       return vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);
 
-   pool->size = size;
+   pool->size = pool_size;
    pool->next = 0;
    pool->free_list = EMPTY;