fix the crash bug when specifying non-existed option.

Change-Id: I68521b92c1c83bed81746d92fe11d50055843992

R=dhendrix@chromium.org
BUG=No bug id.
TEST=Tested with "vpd --clean", and program didn't segmentation fail.

Review URL: http://codereview.chromium.org/6728023
1 file changed
tree: 1831d9aec2b4a5d9613738743af09e248cfe5c24
  1. LICENSE
  2. Makefile
  3. README
  4. include/
  5. lib/
  6. util/
  7. vpd.c