Fix clntraw_create initialization

clntraw_create has been broken since inception; on the first call, it
would compute invalid values of xdrs and client and dereference them.
Fix that.  (This is pretty strong evidence that no one has ever used
it.)  Reported by Nickolai Zeldovich <nickolai@csail.mit.edu>.

https://github.com/krb5/krb5/commit/8b43dd0cec3645d64e4eb9f6d0fcfc2a31d1955d
Author: Greg Hudson <ghudson@mit.edu>
Commit: 8b43dd0cec3645d64e4eb9f6d0fcfc2a31d1955d
Branch: master
 src/lib/rpc/clnt_raw.c |   18 ++++++++++--------
 1 files changed, 10 insertions(+), 8 deletions(-)