This patch cleans the init part of the lm78 driver.

* Do not reset the chip.

* Get rid of useless code, which was accidentally left in when we
removed the limit initialization from the driver.

* Do not enable monitoring if it is already enabled (it wouldn't hurt,
but since we can avoid it at no cost...)

Similar changes were applied to the Linux 2.4 driver, which I
successfully tested on my own LM78 chip.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>