doc: fix pt_insn_next() arguments in examples

The pt_insn_next() function takes an additional size argument that is missing
in code examples in doc/howto_libipt.md.  Add it.

Change-Id: Ibb1226a79b6605b481778a5af440789d8c05b86a
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
1 file changed