Non-Windows EXEC_BACKEND path was broken by recent write_inheritable_socket

change ... it's got to return true.

src/backend/postmaster/postmaster.c

@@ -37,7 +37,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.590 2009/08/24 20:08:32 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.591 2009/08/28 17:42:54 tgl Exp $
  *
  * NOTES
  *
@@ -4488,7 +4488,7 @@ extern PMSignalData *PMSignalState;
 extern int	pgStatSock;
 
 #ifndef WIN32
-#define write_inheritable_socket(dest, src, childpid) (*(dest) = (src))
+#define write_inheritable_socket(dest, src, childpid) ((*(dest) = (src)), true)
 #define read_inheritable_socket(dest, src) (*(dest) = *(src))
 #else
 static bool write_duplicated_handle(HANDLE *dest, HANDLE src, HANDLE child);