[media] dvbdev: add a dvb_detach() macro

The dvb_attach() was unbalanced, as there was no dvb_dettach. Ok,
on current cases, the dettach is done by dvbdev, but that are some
future corner cases where we may need to do this before registering
the frontend.

So, add a dvb_detach() and use it at dvb_frontend.c.
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/dvb-core/dvb_frontend.c

@@ -2666,20 +2666,20 @@ void dvb_frontend_detach(struct dvb_frontend* fe)
 
 	if (fe->ops.release_sec) {
 		fe->ops.release_sec(fe);
-		symbol_put_addr(fe->ops.release_sec);
+		dvb_detach(fe->ops.release_sec);
 	}
 	if (fe->ops.tuner_ops.release) {
 		fe->ops.tuner_ops.release(fe);
-		symbol_put_addr(fe->ops.tuner_ops.release);
+		dvb_detach(fe->ops.tuner_ops.release);
 	}
 	if (fe->ops.analog_ops.release) {
 		fe->ops.analog_ops.release(fe);
-		symbol_put_addr(fe->ops.analog_ops.release);
+		dvb_detach(fe->ops.analog_ops.release);
 	}
 	ptr = (void*)fe->ops.release;
 	if (ptr) {
 		fe->ops.release(fe);
-		symbol_put_addr(ptr);
+		dvb_detach(ptr);
 	}
 }
 #else

drivers/media/dvb-core/dvbdev.h

@@ -136,11 +136,15 @@ extern int dvb_usercopy(struct file *file, unsigned int cmd, unsigned long arg,
 	__r; \
 })
 
+#define dvb_detach(FUNC)	symbol_put_addr(FUNC)
+
 #else
 #define dvb_attach(FUNCTION, ARGS...) ({ \
 	FUNCTION(ARGS); \
 })
 
+#define dvb_detach(FUNC)	{}
+
 #endif
 
 #endif /* #ifndef _DVBDEV_H_ */