pgsql: DropRelFileNodeBuffers failed to fix the state of the lookup hash

Log Message:
-----------
DropRelFileNodeBuffers failed to fix the state of the lookup hash table
that was added to localbuf.c in 8.1; therefore, applying it to a temp table
left corrupt lookup state in memory.  The only case where this had a
significant chance of causing problems was an ON COMMIT DELETE ROWS temp
table; the other possible paths left bogus state that was unlikely to
be used again.  Per report from Csaba Nagy.

Modified Files:
--------------
    pgsql/src/backend/storage/buffer:
        bufmgr.c (r1.198 -> r1.199)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/buffer/bufmgr.c.diff?r1=1.198&r2=1.199)
        localbuf.c (r1.70 -> r1.71)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/buffer/localbuf.c.diff?r1=1.70&r2=1.71)
    pgsql/src/include/storage:
        buf_internals.h (r1.81 -> r1.82)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/storage/buf_internals.h.diff?r1=1.81&r2=1.82)