Avoid malloc(0). Although standard mallocs seem not to object,

some debugging malloc packages do.

src/pl/plpgsql/src/pl_comp.c

@@ -3,7 +3,7 @@
  *			  procedural language
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/pl/plpgsql/src/pl_comp.c,v 1.65 2003/08/04 00:43:33 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/pl/plpgsql/src/pl_comp.c,v 1.66 2003/08/08 19:19:32 tgl Exp $
  *
  *	  This software is copyrighted by Jan Wieck - Hamburg.
  *
@@ -1662,6 +1662,8 @@ plpgsql_add_initdatums(int **varnos)
 	}
 
 	if (varnos != NULL)
+	{
+		if (n > 0)
 		{
 			*varnos = (int *) malloc(sizeof(int) * n);
 
@@ -1678,6 +1680,9 @@ plpgsql_add_initdatums(int **varnos)
 				}
 			}
 		}
+		else
+			*varnos = NULL;
+	}
 
 	datums_last = plpgsql_nDatums;
 	return n;