Return -errno instead of -1 on errors and add error checks in some
places that didn't have one. Passing things by reference requires more
correct typing, replaced a few off_ts therefore - with a 32-bit off_t
this is even a fix for truncation bugs.
While touching the code, fix even some more memory leaks than in the
other drivers...
Signed-off-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>