kdc: -Wcalloc-transposed args

warning: 'calloc' sizes specified with 'sizeof' in the earlier argument
and not in the later argument [-Wcalloc-transposed-args].

Swap the args.

kdc/process.c

@@ -383,7 +383,7 @@ process_request(krb5_context context,
     unsigned int i;
     int claim = 0;
 
-    r = calloc(sizeof(*r), 1);
+    r = calloc(1, sizeof(*r));
     if (!r)
 	return krb5_enomem(context);