libipt: zero/positive return values
libipt: zero/positive return values

There might be a need for status indications in the instruction flow decoder
similar to what is currently done in the query decoder.

Change-Id: Ie3d70efe974ad3dc1ce7c565a65974221652d6a2
Signed-off-by: Markus Metzger <5f675b2b36595f90898e014b548ff7d9bbff2ab7@intel.com>

drupalhunter-team/processor-trace,01org/processor-trace,andikleen/processor-trace,breadbaconic/processor-trace,pombreda/processor-trace,shadown/processor-trace,01org/processor-trace,hoangt/processor-trace,drupalhunter-team/processor-trace,breadbaconic/processor-trace,shadown/processor-trace,hoangt/processor-trace,01org/processor-trace,pombreda/processor-trace,andikleen/processor-trace