bgpd: malformed attribute error that can still proceed should fixup getp

* bgp_attr.c: (bgp_attr_malformed) When a malformed attribute error can be
  ignored, and BGP message processing may still proceed, the stream getp
  should be adjusted to the end of the attribute - the caller may not have
  consumed all the attribute. Problem noted by Martin Winter in bug 678.

  Also, rename the 'startp' local to 'notify_datap', for clarity.
1 file changed