[librsvg] Fix crash on malformed SVG file

[Christian Persch <chpe src gnome org>]

commit edbb480e5214f19e46d5aba89727202febae8857
Author: Bruno Girin <brunogirin gmail com>
Date:   Sun Oct 2 14:08:36 2011 +0200

    Fix crash on malformed SVG file
    
    https://bugzilla.gnome.org/show_bug.cgi?id=626559

 rsvg-paint-server.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/rsvg-paint-server.c b/rsvg-paint-server.c
index 7903684..84c0395 100644
--- a/rsvg-paint-server.c
+++ b/rsvg-paint-server.c
@@ -118,7 +118,7 @@ rsvg_paint_server_parse (gboolean * inherit, const RsvgDefs * defs, const char *
     guint32 rgb;
     if (inherit != NULL)
         *inherit = 1;
-    if (!strcmp (str, "none"))
+    if (str == NULL || !strcmp (str, "none"))
         return NULL;
 
     name = rsvg_get_url_string (str);