tree 34c08d53263881199349929b9a344d298e4cc036
parent 16abe7acb8f1dbeb8b9b1dc41061a53dcbfea851
author Brian Swetland <swetland@google.com> 1285283183 -0700
committer Brian Swetland <swetland@google.com> 1285283183 -0700

zero the entire journal instead of just the first block

I'm seeing some weeeeird stuff with sparse ext4 images where
files sometimes seem to come back from the dead after reflashing,
etc.  My crazy theory is they are hiding in the journal.

Colin humored me and pointed out how to ensure it's entirely
zero'd.

Change-Id: I4d14a2d4879c10540ef3c677ceb523bc061c1ec1