ptdump: diagnose unknown options

When an unknown option is used, ptdump prints a one-line usage help.  Diagnose
the error and print the unknown option, instead.

Change-Id: I1e3bd85d0bbdc602182644805a5dfe23cff14bf4
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
1 file changed