drm/amdgpu: Clean up errors in amdgpu_rlc.c

Fix the following errors reported by checkpatch:

ERROR: space prohibited before that '++' (ctx:WxB)

Signed-off-by: chenxuebing <chenxb_99091@126.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>