radv: Use correct buffer count with variable descriptor set sizes.

Fixes dEQP-VK.binding_model.descriptorset_random.sets16.noarray.ubolimitlow.sbolimitlow.imglimitlow.iublimitlow.frag.ialimitlow.0

CC: <mesa-stable@lists.freedesktop.org>
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/2607
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4489>

src/amd/vulkan/radv_cmd_buffer.c

@@ -3554,7 +3554,7 @@ radv_bind_descriptor_set(struct radv_cmd_buffer *cmd_buffer,
 	assert(!(set->layout->flags & VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR));
 
 	if (!cmd_buffer->device->use_global_bo_list) {
-		for (unsigned j = 0; j < set->layout->buffer_count; ++j)
+		for (unsigned j = 0; j < set->buffer_count; ++j)
 			if (set->descriptors[j])
 				radv_cs_add_buffer(ws, cmd_buffer->cs, set->descriptors[j]);
 	}

src/amd/vulkan/radv_descriptor_set.c

@@ -512,6 +512,7 @@ radv_descriptor_set_create(struct radv_device *device,
 	}
 
 	set->layout = layout;
+	set->buffer_count = buffer_count;
 	uint32_t layout_size = layout->size;
 	if (variable_count) {
 		assert(layout->has_variable_descriptors);

src/amd/vulkan/radv_private.h

@@ -896,6 +896,7 @@ struct radv_descriptor_range {
 struct radv_descriptor_set {
 	const struct radv_descriptor_set_layout *layout;
 	uint32_t size;
+	uint32_t buffer_count;
 
 	struct radeon_winsys_bo *bo;
 	uint64_t va;