ptdump: check argc for options taking an argument
ptdump: check argc for options taking an argument

Ptdump crashes when specifying an option that takes an argument last and
without the argument.  Fix it.

Change-Id: I52e5c26d8fd01fb6545c0add5bc375ab64476b92
Signed-off-by: Markus Metzger <5f675b2b36595f90898e014b548ff7d9bbff2ab7@intel.com>

01org/processor-trace,01org/processor-trace,01org/processor-trace