Two Minor bug fixes to incremental support

Two Minor bug fixes to incremental support

One: a single character typo (of instead of or in an error printout)
Two: Audited usage of tfd file descriptor.  Make sure that the tfd file
is always closed after usage, and that the tfd variable is reset to -1
if we are going to continue in our loop (not necessary if we know we
will return from our function without going through the dv loop again).

Signed-off-by: Doug Ledford <dledford@redhat.com>