sutils: fix file_name_lookup_carefully

file_name_lookup_carefully is like file_name_lookup but tries hard to
avoid starting any passive translators while doing the lookup. The
callback contains code to get a new handle to the root if it
encounters a translator, but this code was not being executed if the
node had no record of an passive translator, just an active one.

Fix the callback by dropping the test for a passive translator. AIUI
the current check for a passive translator makes no sense, as the code
is supposed to fail on encountering a passive translator.

This fixes lookups inside translators that have no passive
translator. For example if /run is a tmpfs started only as active
translator, touch /run/lock && mount tmpfs -t tmpfs /run/lock -o
size=5M would fail.

* sutils/clookup.c (lookup): Drop the test for an passive translator.

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