V4L/DVB (11566): remove broken macro from dvb stv0900_priv.h

It both has unbalanced parentheses and == is not = and it's not used
anywhere anyway.
Signed-off-by: Mariusz Kozlowski <m.kozlowski@tuxland.pl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/frontends/stv0900_priv.h

@@ -60,8 +60,6 @@
 		} \
 	} while (0)
 
-#define dmd_choose(a, b)	(demod = STV0900_DEMOD_2 ? b : a))
-
 static int stvdebug;
 
 #define dprintk(args...) \