color: Fix an assertion failure with embedded NUL bytes

Leading NUL bytes (e.g. `*\0.gz=...`) could cause us to insert a
non-prefix-free set of strings into the case-insensitive extension trie,
which would lead to crashes like

   bfs: trie_split@src/trie.c:538: Assertion failed: `key_nibble != rep_nibble`

and OOB accesses to trie leaf keys.  Fix it by ignoring those
extensions, since filenames cannot contain NUL bytes.

Fixes: 08030aea ("color: Delay the case_sensitive decision")

0 files changed, 0 insertions, 0 deletions