V4L/DVB (5837): stv0299: Fix signedness warning (gcc 4.1.1, kernel 2.6.22)

Fix signedness warning (gcc 4.1.1, kernel 2.6.22).
Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/frontends/stv0299.c

@@ -249,7 +249,7 @@ static int stv0299_get_symbolrate (struct stv0299_state* state)
 	dprintk ("%s\n", __FUNCTION__);
 
 	stv0299_readregs (state, 0x1f, sfr, 3);
-	stv0299_readregs (state, 0x1a, &rtf, 1);
+	stv0299_readregs (state, 0x1a, (u8 *)&rtf, 1);
 
 	srate = (sfr[0] << 8) | sfr[1];
 	srate *= Mclk;