[PATCH] reiserfs: skip commit on io error

This should have been part of the original io error patch, but got
dropped somewhere along the way.

It's extremely important when handling the i/o error in the journal to
not commit the transaction with corrupt data.  This patch adds that code
back in.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>