drm/amdkfd: Use the correct wptr size

Write pointer could be 32-bit or 64-bit. Use the correct size during
initialization.

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

Author: Lijo Lazar

drivers/gpu/drm/amd/amdkfd/kfd_kernel_queue.c

@@ -125,7 +125,7 @@ static bool kq_initialize(struct kernel_queue *kq, struct kfd_node *dev,
 
 	memset(kq->pq_kernel_addr, 0, queue_size);
 	memset(kq->rptr_kernel, 0, sizeof(*kq->rptr_kernel));
-	memset(kq->wptr_kernel, 0, sizeof(*kq->wptr_kernel));
+	memset(kq->wptr_kernel, 0, dev->kfd->device_info.doorbell_size);
 
 	prop.queue_size = queue_size;
 	prop.is_interop = false;