block-qdict: Tweak qdict_flatten_qdict(), qdict_flatten_qlist()

qdict_flatten_qdict() skips copying scalars from @qdict to @target
when the two are the same.  Fair enough, but it uses a non-obvious
test for "same".  Replace it by the obvious one.  While there, improve
comments.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
1 file changed