git-remote: do not use user input in a printf format string

git-remote: do not use user input in a printf format string

'git remote show' substituted the remote name into a string that was later
used as a printf format string. If a remote name contains a printf format
specifier like this:

   $ git remote add foo%sbar .

then the command

   $ git remote show foo%sbar

would print garbage (if you are lucky) or crash. This fixes it.

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>