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.

src/include/storage/buf_internals.h

@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/storage/buf_internals.h,v 1.81 2005/10/15 02:49:46 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/storage/buf_internals.h,v 1.82 2005/11/17 17:42:02 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -198,6 +198,8 @@ extern void BufTableDelete(BufferTag *tagPtr);
 extern BufferDesc *LocalBufferAlloc(Relation reln, BlockNumber blockNum,
 				 bool *foundPtr);
 extern void WriteLocalBuffer(Buffer buffer, bool release);
+extern void DropRelFileNodeLocalBuffers(RelFileNode rnode,
+										BlockNumber firstDelBlock);
 extern void AtEOXact_LocalBuffers(bool isCommit);
 
 #endif   /* BUFMGR_INTERNALS_H */