Cosmetic improvements/code cleanup:

- replace some function signatures of the form "some_type foo()" with
"some_type foo(void)"
- replace a few instances of a literal 0 being used as a NULL pointer;
there are more instances of this in the code, but I just fixed a few
- in src/backend/utils/mb/wstrncmp.c, replace K&R style function
declarations with ANSI style, remove use of 'register' keyword
- remove an "extern" modifier that was applied to a function definition
(rather than a declaration)

src/backend/bootstrap/bootparse.y

@@ -9,7 +9,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/bootstrap/bootparse.y,v 1.73 2004/08/31 17:10:36 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/bootstrap/bootparse.y,v 1.74 2004/10/10 23:37:16 neilc Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -52,7 +52,7 @@
 
 
 static void
-do_start()
+do_start(void)
 {
 	StartTransactionCommand();
 	elog(DEBUG4, "start transaction");
@@ -60,7 +60,7 @@ do_start()
 
 
 static void
-do_end()
+do_end(void)
 {
 	CommitTransactionCommand();
 	elog(DEBUG4, "commit transaction");