In certain circumstances, if a manifest with "time" keywords was
compared to another manifest with "tar_time" keywords, differences were
not actually reported despite there being logic for it.
Unfortunately, even though commit 26ff922da6 ("compare: implement
mtree.DirectoryHierarchy comparisons") explicitly included logic to
handle the necessary "time" -> "tar_time" conversions, the same commit
also made it so that Compare() could be instructed to only consider a
subset of keywords and failed to take into account said "time" ->
"tar_time" remapping.
Most users have likely not noticed this because gomtree will re-use the
keywords from a manifest when doing a straightforward "gomtree validate"
invocation, but if you explicitly requested "time" when validating a
"tar_time" manifest (and *not* the other way around) then any time
changes would be undetected.
Fixes: 26ff922da6 ("compare: implement mtree.DirectoryHierarchy comparisons")
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
