Tidy up a few calls to smrgextend().

In the new API introduced by my patch to include the backend ID in
temprel filenames, the last argument to smrgextend() became skipFsync
rather than isTemp, but these calls didn't get the memo.  It's not
really a problem to pass rel->rd_istemp rather than just plain false,
because smgrextend() now automatically skips the fsync for temprels
anyway, but this seems cleaner and saves some minute number of cycles.

src/backend/access/hash/hashpage.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/hash/hashpage.c,v 1.83 2010/02/26 02:00:33 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/hash/hashpage.c,v 1.84 2010/08/19 02:58:37 rhaas Exp $
  *
  * NOTES
  *	  Postgres hash pages look like ordinary relation pages.  The opaque
@@ -733,7 +733,7 @@ _hash_alloc_buckets(Relation rel, BlockNumber firstblock, uint32 nblocks)
 	MemSet(zerobuf, 0, sizeof(zerobuf));
 
 	RelationOpenSmgr(rel);
-	smgrextend(rel->rd_smgr, MAIN_FORKNUM, lastblock, zerobuf, rel->rd_istemp);
+	smgrextend(rel->rd_smgr, MAIN_FORKNUM, lastblock, zerobuf, false);
 
 	return true;
 }

src/backend/access/heap/visibilitymap.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/heap/visibilitymap.c,v 1.11 2010/08/13 20:10:50 rhaas Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/heap/visibilitymap.c,v 1.12 2010/08/19 02:58:37 rhaas Exp $
  *
  * INTERFACE ROUTINES
  *		visibilitymap_clear - clear a bit in the visibility map
@@ -477,7 +477,7 @@ vm_extend(Relation rel, BlockNumber vm_nblocks)
 	while (vm_nblocks_now < vm_nblocks)
 	{
 		smgrextend(rel->rd_smgr, VISIBILITYMAP_FORKNUM, vm_nblocks_now,
-				   (char *) pg, rel->rd_istemp);
+				   (char *) pg, false);
 		vm_nblocks_now++;
 	}
 

src/backend/storage/freespace/freespace.c

@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/storage/freespace/freespace.c,v 1.78 2010/08/13 20:10:52 rhaas Exp $
+ *	  $PostgreSQL: pgsql/src/backend/storage/freespace/freespace.c,v 1.79 2010/08/19 02:58:37 rhaas Exp $
  *
  *
  * NOTES:
@@ -588,7 +588,7 @@ fsm_extend(Relation rel, BlockNumber fsm_nblocks)
 	while (fsm_nblocks_now < fsm_nblocks)
 	{
 		smgrextend(rel->rd_smgr, FSM_FORKNUM, fsm_nblocks_now,
-				   (char *) pg, rel->rd_istemp);
+				   (char *) pg, false);
 		fsm_nblocks_now++;
 	}