drm/amdgpu/vcn: Remove unneeded semicolon

report by coccicheck:
drivers/gpu/drm/amd/amdgpu/vcn_v2_5.c:1951:2-3: Unneeded semicolon

Fixes: c543dcbe

 ("drm/amdgpu/vcn: Add VCN ras error query support")

Signed-off-by: Haowen Bai <baihaowen@meizu.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>