drm/amdgpu: fix semicolon.cocci warnings

drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c:281:2-3: Unneeded semicolon

 Remove unneeded semicolon.

Generated by: scripts/coccinelle/misc/semicolon.cocci

Fixes: 620f774f ("drm/amdgpu: separate VMID and PASID handling")
CC: Christian König <christian.koenig@amd.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>