[media] Mantis: use dvb_attach to avoid double dereferencing on module removal

Convert the driver to use the dvb_attach macro to avoid the hard dependency
on the frontend drivers. The hard dependecy will result in loading a
number of unused frontends, and unwanted automatic dereferencing.

This fixes a bug where unloading the mantis driver will derefence any
attached frontend twice, which will cause an oops if the same frontend is
used by another driver.

Signed-off-by: Bjørn Mork <[e-mail]>
Signed-off-by: Manu Abraham <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/dvb/mantis/hopper_vp3028.c

···
 	if (err == 0) {
 		msleep(250);
 		dprintk(MANTIS_ERROR, 1, "Probing for 10353 (DVB-T)");
-		fe = zl10353_attach(&hopper_vp3028_config, adapter);
+		fe = dvb_attach(zl10353_attach, &hopper_vp3028_config, adapter);
 
 		if (!fe)
 			return -1;

drivers/media/dvb/mantis/mantis_vp1033.c

···
 		msleep(250);
 
 		dprintk(MANTIS_ERROR, 1, "Probing for STV0299 (DVB-S)");
-		fe = stv0299_attach(&lgtdqcs001f_config, adapter);
+		fe = dvb_attach(stv0299_attach, &lgtdqcs001f_config, adapter);
 
 		if (fe) {
 			fe->ops.tuner_ops.set_params = lgtdqcs001f_tuner_set;

drivers/media/dvb/mantis/mantis_vp1034.c

···
 		msleep(250);
 
 		dprintk(MANTIS_ERROR, 1, "Probing for MB86A16 (DVB-S/DSS)");
-		fe = mb86a16_attach(&vp1034_mb86a16_config, adapter);
+		fe = dvb_attach(mb86a16_attach, &vp1034_mb86a16_config, adapter);
 		if (fe) {
 			dprintk(MANTIS_ERROR, 1,
 			"found MB86A16 DVB-S/DSS frontend @0x%02x",

drivers/media/dvb/mantis/mantis_vp1041.c

···
 	if (err == 0) {
 		mantis_frontend_soft_reset(mantis);
 		msleep(250);
-		mantis->fe = stb0899_attach(&vp1041_stb0899_config, adapter);
+		mantis->fe = dvb_attach(stb0899_attach, &vp1041_stb0899_config, adapter);
 		if (mantis->fe) {
 			dprintk(MANTIS_ERROR, 1,
 				"found STB0899 DVB-S/DVB-S2 frontend @0x%02x",
 				vp1041_stb0899_config.demod_address);
 
-			if (stb6100_attach(mantis->fe, &vp1041_stb6100_config, adapter)) {
-				if (!lnbp21_attach(mantis->fe, adapter, 0, 0))
+			if (dvb_attach(stb6100_attach, mantis->fe, &vp1041_stb6100_config, adapter)) {
+				if (!dvb_attach(lnbp21_attach, mantis->fe, adapter, 0, 0))
 					dprintk(MANTIS_ERROR, 1, "No LNBP21 found!");
 			}
 		} else {

drivers/media/dvb/mantis/mantis_vp2033.c

···
 		msleep(250);
 
 		dprintk(MANTIS_ERROR, 1, "Probing for CU1216 (DVB-C)");
-		fe = tda10021_attach(&vp2033_tda1002x_cu1216_config,
+		fe = dvb_attach(tda10021_attach, &vp2033_tda1002x_cu1216_config,
 				     adapter,
 				     read_pwm(mantis));
 
···
 				"found Philips CU1216 DVB-C frontend (TDA10021) @ 0x%02x",
 				vp2033_tda1002x_cu1216_config.demod_address);
 		} else {
-			fe = tda10023_attach(&vp2033_tda10023_cu1216_config,
+			fe = dvb_attach(tda10023_attach, &vp2033_tda10023_cu1216_config,
 					     adapter,
 					     read_pwm(mantis));
 

drivers/media/dvb/mantis/mantis_vp2040.c

···
 		msleep(250);
 
 		dprintk(MANTIS_ERROR, 1, "Probing for CU1216 (DVB-C)");
-		fe = tda10021_attach(&vp2040_tda1002x_cu1216_config,
+		fe = dvb_attach(tda10021_attach, &vp2040_tda1002x_cu1216_config,
 				     adapter,
 				     read_pwm(mantis));
 
···
 				"found Philips CU1216 DVB-C frontend (TDA10021) @ 0x%02x",
 				vp2040_tda1002x_cu1216_config.demod_address);
 		} else {
-			fe = tda10023_attach(&vp2040_tda10023_cu1216_config,
+			fe = dvb_attach(tda10023_attach, &vp2040_tda10023_cu1216_config,
 					     adapter,
 					     read_pwm(mantis));
 

drivers/media/dvb/mantis/mantis_vp3030.c

···
 	if (err == 0) {
 		msleep(250);
 		dprintk(MANTIS_ERROR, 1, "Probing for 10353 (DVB-T)");
-		fe = zl10353_attach(&mantis_vp3030_config, adapter);
+		fe = dvb_attach(zl10353_attach, &mantis_vp3030_config, adapter);
 
 		if (!fe)
 			return -1;
 
-		tda665x_attach(fe, &env57h12d5_config, adapter);
+		dvb_attach(tda665x_attach, fe, &env57h12d5_config, adapter);
 	} else {
 		dprintk(MANTIS_ERROR, 1, "Frontend on <%s> POWER ON failed! <%d>",
 			adapter->name,