V4L/DVB (11591): stv090x: code simplification

static s32 stv090x_get_car_freq(struct stv090x_state *state, u32 mclk)

{

	s32 derot, int_1, int_2, tmp_1, tmp_2;

	u32 pow2;

	derot  = STV090x_READ_DEMOD(state, CFR2) << 16;

	derot |= STV090x_READ_DEMOD(state, CFR1) <<  8;

	derot |= STV090x_READ_DEMOD(state, CFR0);

	derot = comp2(derot, 24);

	pow2 = 1 << 12;

	int_1 = state->mclk / pow2;

	int_2 = derot / pow2;

	int_1 = state->mclk >> 12;

	int_2 = derot >> 12;

	tmp_1 = state->mclk % pow2;

	tmp_2 = derot % pow2;

	/* carrier_frequency = MasterClock * Reg / 2^24 */

	tmp_1 = state->mclk % 0x1000;

	tmp_2 = derot % 0x1000;

	derot = (int_1 * int_2) +

		((int_1 * tmp_2) / pow2) +

		((int_1 * tmp_1) / pow2);

		((int_1 * tmp_2) >> 12) +

		((int_1 * tmp_1) >> 12);

	return derot;

}