Fixed rewind on parseLabel.

14 test failures now, all with emphasis.  IN most of all of these
cases, the examples in the spec seem to be mistakes, given what
the spec says.

More troubling, performance is down from around 220 to 83.  This
needs investigation.

1 files changed, 3 insertions, 2 deletions

diff --git a/js/stmd.js b/js/stmd.js
index 8fc7f20..7d0a532 100755
--- a/js/stmd.js
+++ b/js/stmd.js
@@ -456,7 +456,7 @@ var parseLink = function() {
 
   n = this.parseLinkLabel();
   if (n === 0) {
-    return 0;
+    return null;
   }
   var afterlabel = this.pos;
   var rawlabel = this.subject.substr(startpos, n);
@@ -479,7 +479,7 @@ var parseLink = function() {
                  label: parseRawLabel(rawlabel) };
      } else {
         this.pos = startpos;
-        return 0;
+        return null;
      }
   }
   // If we're here, it wasn't an explicit link. Try to parse a reference link.
@@ -505,6 +505,7 @@ var parseLink = function() {
             title: link.title,
             label: parseRawLabel(rawlabel) };
   } else {
+      this.pos = startpos;
       return null;
   }
   // Nothing worked, rewind: