pgsql: Fix a second cause of undersized pallocs for btree_gist indexes

Fix a second cause of undersized pallocs for btree_gist indexes on macaddr.

gbt_macad_union also allocated 12-byte structs where we really need 16.

Per report from Andres Freund. No back-patch since there's no current
risk of a real problem.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/39586bc1e971c136c4487b26eb7334dbbe23b102

Modified Files
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contrib/btree_gist/btree_macaddr.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

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