[gnumeric] SHEETS: Fix leaks.

[Morten Welinder <mortenw src gnome org>]

commit 084afb211315cb72f9dd9ee9f42a8cfea33db1b0
Author: Morten Welinder <terra gnome org>
Date:   Sat May 21 22:10:53 2011 -0400

    SHEETS: Fix leaks.

 NEWS                          |    1 +
 plugins/fn-lookup/ChangeLog   |    1 +
 plugins/fn-lookup/functions.c |    8 ++++----
 3 files changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/NEWS b/NEWS
index 1453305..3429466 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,7 @@ Gnumeric 1.10.16
 
 Morten:
 	* Fix leaks in SHEET.  [#650761]
+	* Fix leaks in SHEETS.  [#650764]
 
 --------------------------------------------------------------------------
 Gnumeric 1.10.15
diff --git a/plugins/fn-lookup/ChangeLog b/plugins/fn-lookup/ChangeLog
index ce7e4a8..4154dfc 100644
--- a/plugins/fn-lookup/ChangeLog
+++ b/plugins/fn-lookup/ChangeLog
@@ -1,6 +1,7 @@
 2011-05-21  Morten Welinder  <terra gnome org>
 
 	* functions.c (gnumeric_sheet): Simplify.  Fixes #650761.
+	(gnumeric_sheets): Simplify.  Fixes #650764.
 
 2011-05-21  Morten Welinder <terra gnome org>
 
diff --git a/plugins/fn-lookup/functions.c b/plugins/fn-lookup/functions.c
index 630e218..5223a34 100644
--- a/plugins/fn-lookup/functions.c
+++ b/plugins/fn-lookup/functions.c
@@ -1584,11 +1584,11 @@ gnumeric_sheets (GnmFuncEvalInfo *ei, GnmValue const * const *args)
 			GnmRangeRef const *r = &v->v_range.cell;
 			int ans_min, ans_max, a, b;
 
-			a = g_slist_index (workbook_sheets (wb), r->a.sheet);
-			b = g_slist_index (workbook_sheets (wb), r->b.sheet);
+			a = r->a.sheet ? r->a.sheet->index_in_wb : -1;
+			b = r->b.sheet ? r->b.sheet->index_in_wb : -1;
 
-			ans_min = (a < b) ? a : b;
-			ans_max = (a < b) ? b : a;
+			ans_min = MIN (a,b);
+			ans_max = MAX (a,b);
 
 			if (ans_min == -1)
 				return value_new_int (1);