[gnumeric] xlsx: fix last fix.

[Morten Welinder <mortenw src gnome org>]

commit 7d01eff068f2df542ee466add6df1e1b63654f22
Author: Morten Welinder <terra gnome org>
Date:   Mon Feb 23 10:25:38 2015 -0500

    xlsx: fix last fix.

 plugins/excel/xlsx-write-drawing.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/plugins/excel/xlsx-write-drawing.c b/plugins/excel/xlsx-write-drawing.c
index db142a2..0144825 100644
--- a/plugins/excel/xlsx-write-drawing.c
+++ b/plugins/excel/xlsx-write-drawing.c
@@ -1359,8 +1359,8 @@ xlsx_write_drawing_objects (XLSXWriteState *state, GsfOutput *sheet_part,
 static int
 cb_radio_value_cmp (void const *ptr_a, void const *ptr_b)
 {
-       GnmValue *va = sheet_widget_radio_button_get_value ((SheetObject *)ptr_a);
-       GnmValue *vb = sheet_widget_radio_button_get_value ((SheetObject *)ptr_a);
+       GnmValue const *va = sheet_widget_radio_button_get_value ((SheetObject *)ptr_a);
+       GnmValue const *vb = sheet_widget_radio_button_get_value ((SheetObject *)ptr_b);
        return value_cmp (&va, &vb);
 }