Adds null pointer check, which is hit by one of the recent additional tests I 
submitted.

Brad
# Bazaar merge directive format 2 (Bazaar 0.90)
# revision_id: [email protected]\
#   wy7mpxasgx1t2vjp
# target_branch: http://bzr.savannah.gnu.org/r/pdf/libgnupdf/branches\
#   /trunk/
# testament_sha1: e91918e4022991c4eb1e403ab165317be4442c9c
# timestamp: 2009-06-17 14:22:28 +1000
# base_revision_id: [email protected]\
#   k500wrxphi8b7sqj
# 
# Begin patch
=== modified file 'AUTHORS'
--- AUTHORS	2009-06-17 00:04:53 +0000
+++ AUTHORS	2009-06-17 04:17:19 +0000
@@ -73,6 +73,7 @@
 
 Brad Hards: changed doc/gnupdf-hg.texi
   doc/gnupdf.texi
+  src/base/pdf-time.c
   torture/unit/base/time/pdf-time-from-string.c
   torture/unit/base/time/pdf-time-copy.c 
   torture/unit/base/crypt/pdf-crypt-md-new.c

=== modified file 'ChangeLog'
--- ChangeLog	2009-06-17 03:57:06 +0000
+++ ChangeLog	2009-06-17 04:17:19 +0000
@@ -1,5 +1,8 @@
 2009-06-17  Brad Hards  <[email protected]>
 
+	* src/base/pdf-time.c (pdf_time_span_negate): protect against null
+	argument.
+
 	* doc/gnupdf.texi: various typo fixes 
 
 	* doc/gnupdf-hg.texi (Running the unit tests): document use of

=== modified file 'src/base/pdf-time.c'
--- src/base/pdf-time.c	2009-06-16 08:35:10 +0000
+++ src/base/pdf-time.c	2009-06-17 04:17:19 +0000
@@ -1074,6 +1074,8 @@
 pdf_time_span_negate (pdf_time_span_t *p_span)
 {
   pdf_status_t p_status = PDF_OK;
+  if (p_span == NULL)
+    return PDF_ERROR;
   pdf_i64_neg(p_span, *p_span, &p_status);
   return p_status;
 }

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