zap_leaf: make l_hash[] variable length to silence UBSAN #15964
Merged
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Motivation and Context
When UBSAN is active and OpenZFS is a debug build, the l_hash assert at the bottom of zap_open_leaf() causes UBSAN to complain.
Description
This follows the example in 786641d to shut it up.
How Has This Been Tested?
At first it was not shut up, and then it was, hurrah!
Types of changes
Checklist:
Signed-off-by
.