[tracker] libtracker-extract: XMP: Protect against division by zero

[Philip Van Hoof <pvanhoof src gnome org>]

commit c0d2eb32f5265e6afc58ca9e8eb6960870588723
Author: Philip Van Hoof <philip codeminded be>
Date:   Fri May 21 18:05:32 2010 +0200

    libtracker-extract: XMP: Protect against division by zero

 src/libtracker-extract/tracker-xmp.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/src/libtracker-extract/tracker-xmp.c b/src/libtracker-extract/tracker-xmp.c
index 0d4e94e..925b9c3 100644
--- a/src/libtracker-extract/tracker-xmp.c
+++ b/src/libtracker-extract/tracker-xmp.c
@@ -163,7 +163,10 @@ div_str_dup (const gchar *value)
 		cpy [ptr - value] = '\0';
 		a = atoi (cpy);
 		b = atoi (cpy + (ptr - value) + 1);
-		ret = g_strdup_printf ("%G", ((gdouble)((gdouble) a / (gdouble) b)));
+		if (b != 0)
+			ret = g_strdup_printf ("%G", ((gdouble)((gdouble) a / (gdouble) b)));
+		else
+			ret = NULL;
 		g_free (cpy);
 	} else {
 		ret = g_strdup (value);