SUNRPC: Silence warnings about parameters not being described

Warning: net/sunrpc/auth_gss/gss_krb5_crypto.c:902 function parameter
'len' not described in 'krb5_etm_decrypt'
Warning: net/sunrpc/auth_gss/gss_krb5_crypto.c:902 function parameter
'buf' not described in 'krb5_etm_decrypt'

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

Author: Trond Myklebust

net/sunrpc/auth_gss/gss_krb5_crypto.c

@@ -875,8 +875,8 @@ krb5_etm_encrypt(struct krb5_ctx *kctx, u32 offset,
  * krb5_etm_decrypt - Decrypt using the RFC 8009 rules
  * @kctx: Kerberos context
  * @offset: starting offset of the ciphertext, in bytes
- * @len:
- * @buf:
+ * @len: size of ciphertext to unwrap
+ * @buf: ciphertext to unwrap
  * @headskip: OUT: the enctype's confounder length, in octets
  * @tailskip: OUT: the enctype's HMAC length, in octets
  *