[media] lmedm04: use u32 instead of u64 for relative stats

Cleanup this sparse warning:
drivers/media/usb/dvb-usb-v2/lmedm04.c:302 lme2510_update_stats() warn: should '((255 - st->signal_sn - 161) * 3) << 8' be a 64 bit type?

Both c_tmp and s_tmp actually stores a u16 stat. Using a u64 data
there is a waste, specially on u32 archs, as 64 ints there are more
expensive.

So, change the types to u32 and do the typecast only when storing
the result.

Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/usb/dvb-usb-v2/lmedm04.c

···
 	struct lme2510_state *st = adap_to_priv(adap);
 	struct dvb_frontend *fe = adap->fe[0];
 	struct dtv_frontend_properties *c;
-	u64 s_tmp = 0, c_tmp = 0;
+	u32 s_tmp = 0, c_tmp = 0;
 
 	if (!fe)
 		return;
···
 
 	c->strength.len = 1;
 	c->strength.stat[0].scale = FE_SCALE_RELATIVE;
-	c->strength.stat[0].uvalue = s_tmp;
+	c->strength.stat[0].uvalue = (u64)s_tmp;
 
 	c->cnr.len = 1;
 	c->cnr.stat[0].scale = FE_SCALE_RELATIVE;
-	c->cnr.stat[0].uvalue = c_tmp;
+	c->cnr.stat[0].uvalue = (u64)c_tmp;
 }
 
 static void lme2510_int_response(struct urb *lme_urb)