w1/ds2490: fix excessive logging

[Christian Vogel]

Two issues related to logging to the kernel-log are within w1/ds2490.

First, probably when automatically converting some logging to pr_info
it was overlooked that a lot of newlines are inserted.

Second by default ds2490 is excessively verbose on errors.

These two patches address the issues which were clogging up my harddisk
needlessly.