V4L/DVB (10761): cx18: Change log lines for internal subdevs and fix tveeprom reads

Give messages originating from internal subdevs a header using the subdev's
name.  Fixed an uninitialized variable problem with reading the EEPROM, noticed
from log output.  Got rid of the unused cx18_av_exit() function.

Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/cx18/cx18-driver.c b/drivers/media/video/cx18/cx18-driver.c
index 544abbf..fcc40bf 100644
--- a/drivers/media/video/cx18/cx18-driver.c
+++ b/drivers/media/video/cx18/cx18-driver.c
@@ -272,6 +272,7 @@
 	struct i2c_client c;
 	u8 eedata[256];
 
+	memset(&c, 0, sizeof(c));
 	strncpy(c.name, "cx18 tveeprom tmp", sizeof(c.name));
 	c.name[sizeof(c.name)-1] = '\0';
 	c.adapter = &cx->i2c_adap[0];