[media] stb0899: sign of CRL_FREQ doesn't depend on inversion

Contrary to CFR (derotator frequency), which changes signedness
depending on inversion, CRL_FREQ does not.

Signed-off-by: Reinhard Nißl <[e-mail]>
Signed-off-by: Michael Krufky <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/dvb-frontends/stb0899_algo.c

···
 		else
 			internal->inversion = IQ_SWAP_OFF;
 
-		offsetfreq *= internal->inversion;
-
-		internal->freq = internal->freq - offsetfreq;
+		internal->freq = internal->freq + offsetfreq;
 		internal->srate = stb0899_dvbs2_get_srate(state);
 
 		reg = STB0899_READ_S2REG(STB0899_S2DEMOD, UWP_STAT2);