Initialize iterflags in update_princ_encryption

It is only assigned to in the non-dry-run case, which clang detects
and aborts the build (when maintainer mode is enabled).

https://github.com/krb5/krb5/commit/bf040d0c4072742efab854ab01af162569f0a8f7
Author: Ben Kaduk <kaduk@mit.edu>
Commit: bf040d0c4072742efab854ab01af162569f0a8f7
Branch: master
 src/kadmin/dbutil/kdb5_mkey.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)