drm/amdgpu: remove unused variable num_xcc

gcc with W=1 reports
drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c:2138:13: error: variable
  ‘num_xcc’ set but not used [-Werror=unused-but-set-variable]
 2138 |         int num_xcc;
      |             ^~~~~~~

This variable is not used so remove it.
Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c

@@ -2135,9 +2135,6 @@ static void gfx_v9_4_3_ring_emit_gds_switch(struct amdgpu_ring *ring,
 static int gfx_v9_4_3_early_init(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
-	int num_xcc;
-
-	num_xcc = NUM_XCC(adev->gfx.xcc_mask);
 
 	adev->gfx.num_compute_rings = min(amdgpu_gfx_get_num_kcq(adev),
 					  AMDGPU_MAX_COMPUTE_RINGS);