Log Message:
-----------
Add some simple defenses against null fields in pg_largeobject, and add
comments noting that there's an alignment assumption now that the data
field could be in 1-byte-header format. Per discussion with Greg Stark.
Modified Files:
--------------
pgsql/src/backend/storage/large_object:
inv_api.c (r1.124 -> r1.125)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/large_object/inv_api.c.diff?r1=1.124&r2=1.125)