wflinfo: Fix error message regression on context creation failure

Recent patches which permitted users to call wflinfo with --version
introduced an error message regression. If wflinfo fails to create
a context, then this is wflinfo's sole output, pre-patch:

  Waffle error: 0x0 WAFFLE_NO_ERROR

This patch fixes wflinfo to print the underlying Waffle error or:

  Waffle error: 0x8 WAFFLE_ERROR_BAD_ATTRIBUTE:# Please enter the commit
    message for your changes. Lines starting

Signed-off-by: Chad Versace <chad.versace@linux.intel.com>