[media] dibusb-mb: fix ERROR: do not use assignment in if condition

Signed-off-by: Michael Krufky <mkrufky@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/dvb/dvb-usb/dibusb-mb.c b/drivers/media/dvb/dvb-usb/dibusb-mb.c
index c65bfbf..7270791 100644
--- a/drivers/media/dvb/dvb-usb/dibusb-mb.c
+++ b/drivers/media/dvb/dvb-usb/dibusb-mb.c
@@ -31,8 +31,9 @@
 
 	demod_cfg.demod_address = 0x8;
 
-	if ((adap->fe_adap[0].fe = dvb_attach(dib3000mb_attach, &demod_cfg,
-				   &adap->dev->i2c_adap, &st->ops)) == NULL)
+	adap->fe_adap[0].fe = dvb_attach(dib3000mb_attach, &demod_cfg,
+					 &adap->dev->i2c_adap, &st->ops);
+	if ((adap->fe_adap[0].fe) == NULL)
 		return -ENODEV;
 
 	adap->fe_adap[0].fe->ops.i2c_gate_ctrl = dib3000mb_i2c_gate_ctrl;