Fix hardlink detection on platforms having padding in struct inodev,

typically 64bit platforms.  This was basically broken since forever.
Not only is the padding used, but it was used uninitialized.
Problem reported by jmc@.

1 files changed, 1 insertions, 0 deletions

diff --git a/mandocdb.c b/mandocdb.c
index f9af88d0..f98fa8e5 100644
--- a/mandocdb.c
+++ b/mandocdb.c
@@ -942,6 +942,7 @@ mlink_add(struct mlink *mlink, const struct stat *st)
 	assert(NULL == ohash_find(&mlinks, slot));
 	ohash_insert(&mlinks, slot, mlink);
 
+	memset(&inodev, 0, sizeof(inodev));  /* Clear padding. */
 	inodev.st_ino = st->st_ino;
 	inodev.st_dev = st->st_dev;
 	slot = ohash_lookup_memory(&mpages, (char *)&inodev,