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3db89cbf0e
When the accumulated trie key exceeds the fixed-size line buffer,
linebuf_get() returns NULL. trie_fnmatch_f() passed that NULL straight
into fnmatch() as the pattern, causing a SIGSEGV on a crafted hwdb.bin
(reachable now that recursion is capped rather than overflowing the
stack first). Treat the NULL like the other corruption checks and
return -EBADMSG.
Follow-up for 73fea38cf1
Fixes https://github.com/systemd/systemd/issues/42376
Co-developed-by: Claude Opus 4.8 <noreply@anthropic.com>