[librsvg] Do not draw marker if the target element's line length is 0.

[Hiroyuki Ikezoe <hiikezoe src gnome org>]

commit c1bf7828c67b730bcb65167f547573e1fba72307
Author: Hiroyuki Ikezoe <poincare ikezoe net>
Date:   Sat May 1 08:58:28 2010 +0900

    Do not draw marker if the target element's line length is 0.
    
    Fix for bug 545158.

 rsvg-marker.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/rsvg-marker.c b/rsvg-marker.c
index 9eb8c64..f66b8fc 100644
--- a/rsvg-marker.c
+++ b/rsvg-marker.c
@@ -228,6 +228,9 @@ rsvg_render_markers (const RsvgBpathDef * bpath_def, RsvgDrawingCtx * ctx)
     middlemarker = (RsvgMarker *) state->middleMarker;
     endmarker = (RsvgMarker *) state->endMarker;
 
+    if (linewidth == 0)
+        return;
+
     if (!startmarker && !middlemarker && !endmarker)
         return;