Using a structure for a tdb key can lead to insideous, hard

to find bugs. On 64 bit IRIX, structure packing means that
a
struct {
SMB_DEV_T dev /* 4 bytes */
SMB_INO_T ino /* 8 bytes */
}

has 4 bytes of padding between the two members. If you
don't null the memory before using it as a tdb key,
you randomly can't find keys depending on what is in
the padding. This caused me immense pain and was hard
to track down.... :-)

Jeremy.
(This used to be commit f2a5ba3f0939f59097f0ef6a25f1cf9b5574f157)

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