Repair bug that would allow libpq to think a command had succeeded when

it really hadn't, due to double output of previous command's response.
Fix prevents recursive entry to libpq routines.  Found by Jan Wieck.

src/backend/tcop/postgres.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.432 2004/09/13 20:07:05 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.433 2004/09/26 00:26:25 tgl Exp $
  *
  * NOTES
  *	  this is the "main" module of the postgres backend and
@@ -2811,6 +2811,9 @@ PostgresMain(int argc, char *argv[], const char *username)
 		DisableNotifyInterrupt();
 		DisableCatchupInterrupt();
 
+		/* Make sure libpq is in a good state */
+		pq_comm_reset();
+
 		/* Report the error to the client and/or server log */
 		EmitErrorReport();