[media] dib0090: Remove a dead code

As reported by smatch:
	drivers/media/dvb-frontends/dib0090.c:1710 dib0090_dc_offset_calibration() warn: missing break? reassigning '*tune_state'

There's no need to change tune_state there, as the fall though code
will change it again to another state. So, simplify it by
removing the dead code.

While here, fix a typo:
	Sart => Start
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/dvb-frontends/dib0090.c

@@ -1696,12 +1696,10 @@ static int dib0090_dc_offset_calibration(struct dib0090_state *state, enum front
 
 		if (state->identity.p1g)
 			state->dc = dc_p1g_table;
-		*tune_state = CT_TUNER_STEP_0;
 
 		/* fall through */
-
 	case CT_TUNER_STEP_0:
-		dprintk("Sart/continue DC calibration for %s path", (state->dc->i == 1) ? "I" : "Q");
+		dprintk("Start/continue DC calibration for %s path", (state->dc->i == 1) ? "I" : "Q");
 		dib0090_write_reg(state, 0x01, state->dc->bb1);
 		dib0090_write_reg(state, 0x07, state->bb7 | (state->dc->i << 7));