drm/amdgpu: cleanup unused iterator members for sdma v3

Signed-off-by: Huang Rui <[e-mail]>
Reviewed-by: Christian König <[e-mail]>
Reviewed-by: Alex Deucher <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c

···
 	ib->ptr[ib->length_dw++] = lower_32_bits(pe);
 	ib->ptr[ib->length_dw++] = upper_32_bits(pe);
 	ib->ptr[ib->length_dw++] = ndw;
-	for (; ndw > 0; ndw -= 2, --count, pe += 8) {
+	for (; ndw > 0; ndw -= 2) {
 		ib->ptr[ib->length_dw++] = lower_32_bits(value);
 		ib->ptr[ib->length_dw++] = upper_32_bits(value);
 		value += incr;