drm/amdgpu/sdma5: incorrect variable type for gpu address

Incorrect programming with 64bit gpu address assignment for
32bit variable.

Signed-off-by: Jack Xiao <[e-mail]>
Reviewed-by: Xiaojie Yuan <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c

···
 	u32 doorbell;
 	u32 doorbell_offset;
 	u32 temp;
-	u32 wptr_gpu_addr, wptr_poll_cntl;
+	u32 wptr_poll_cntl;
+	u64 wptr_gpu_addr;
 	int i, r;
 
 	for (i = 0; i < adev->sdma.num_instances; i++) {