[PATCH] g10: fix segfault when using both --card-edit and --with-keygrip flags

[NIIBE Yutaka]

Hello,

Joey Pabalinas <joeypabalinas at gmail.com> wrote:
> * g10/card-util.c (print_keygrip): Add NULL check.

Thanks for your report.  Actually, we can print out the keygrip
information by using tty_fprint.

I pushed that change to both of master and 2.2 branch.
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