Description of problem:

There is a problem in RRDp.pm when the error_mode is set to catch and an error
occurs.

Since the behaviour of rrdtool in pipe mode describes the result of a command
being one of two things

   1. OK followed by the timings
   2. ERROR followed by a relevant string 

the RRDp needs to take into account that the read sequence is complete in either
case.

Unfortunately the ERROR case returns to the read loop rather than returning.
This results in the calling program hanging.

Version-Release number of selected component (if applicable):

rrdtool-1.3-0.1.beta1.fc8

How reproducible:

Always.

Steps to Reproduce:
1. attempt to update an rrd with an old timestamp
2.
3.
  
Actual results:

code hangs in module

Expected results:

returns undef

Additional info:

Upstream report http://oss.oetiker.ch/rrdtool-trac/ticket/118

Upstream fixed commited in
http://oss.oetiker.ch/rrdtool-trac/browser/trunk/program/bindings/perl-piped/RRDp.pm?rev=1209


Revised code available in beta3 package.