[gnumeric] PERIODOGRAM: fix crash.

[Morten Welinder <mortenw src gnome org>]

commit 5bda4f057e15a79e286fee7accc8b21ea4632bab
Author: Morten Welinder <terra gnome org>
Date:   Thu Jun 18 09:31:07 2009 -0400

    PERIODOGRAM: fix crash.

 NEWS                       |    1 +
 plugins/fn-tsa/ChangeLog   |    4 ++++
 plugins/fn-tsa/functions.c |    2 +-
 3 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/NEWS b/NEWS
index 3bd9f45..37cf94c 100644
--- a/NEWS
+++ b/NEWS
@@ -47,6 +47,7 @@ Morten:
 	* Fixed FIXED.  No, really.
 	* Start introducing external references for function docs.
 	* Implement new functions COTH and ACOTH.  [#586170]
+	* Fix tsa crash.  [#586191]
 
 --------------------------------------------------------------------------
 Gnumeric 1.9.8
diff --git a/plugins/fn-tsa/ChangeLog b/plugins/fn-tsa/ChangeLog
index cd10283..809343e 100644
--- a/plugins/fn-tsa/ChangeLog
+++ b/plugins/fn-tsa/ChangeLog
@@ -1,3 +1,7 @@
+2009-06-18  Morten Welinder  <terra gnome org>
+
+	* functions.c (gnumeric_periodogram): Fix crash.  #586191.
+
 2009-06-05  Andreas J. Guelzow <aguelzow pyrshep ca>
 
 	* functions.c (gnm_fourier_fft): moved here from 
diff --git a/plugins/fn-tsa/functions.c b/plugins/fn-tsa/functions.c
index b3028c0..2a94c96 100644
--- a/plugins/fn-tsa/functions.c
+++ b/plugins/fn-tsa/functions.c
@@ -889,7 +889,7 @@ gnumeric_periodogram (GnmFuncEvalInfo *ei, GnmValue const * const *argv)
 	gnm_fourier_fft (in, nb, 1, &out, FALSE);
 	g_free (in);
 	nb /= 2;
-	if (out) {
+	if (out && nb > 0) {
 		res = value_new_array_non_init (1 , nb);
 		res->v_array.vals[0] = g_new (GnmValue *, nb);
 		for (i = 0; i < nb; i++)