sunrpc/auth_gss: fix decoder callback prototypes

Declare the p_decode callbacks with the proper prototype instead of
casting to kxdrdproc_t and losing all type safety.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Acked-by: Trond Myklebust <trond.myklebust@primarydata.com>

net/sunrpc/auth_gss/gss_rpc_upcall.c

@@ -56,7 +56,7 @@ enum {
 [GSSX_##proc] = {					\
 	.p_proc   = GSSX_##proc,			\
 	.p_encode = gssx_enc_##name,	\
-	.p_decode = (kxdrdproc_t)gssx_dec_##name,	\
+	.p_decode = gssx_dec_##name,	\
 	.p_arglen = GSSX_ARG_##name##_sz,		\
 	.p_replen = GSSX_RES_##name##_sz, 		\
 	.p_statidx = GSSX_##proc,			\

net/sunrpc/auth_gss/gss_rpc_xdr.c

@@ -790,8 +790,9 @@ done:
 
 int gssx_dec_accept_sec_context(struct rpc_rqst *rqstp,
 				struct xdr_stream *xdr,
-				struct gssx_res_accept_sec_context *res)
+				void *data)
 {
+	struct gssx_res_accept_sec_context *res = data;
 	u32 value_follows;
 	int err;
 	struct page *scratch;

net/sunrpc/auth_gss/gss_rpc_xdr.h

@@ -182,7 +182,7 @@ void gssx_enc_accept_sec_context(struct rpc_rqst *req,
 				 const void *data);
 int gssx_dec_accept_sec_context(struct rpc_rqst *rqstp,
 				struct xdr_stream *xdr,
-				struct gssx_res_accept_sec_context *res);
+				void *data);
 #define gssx_enc_release_handle NULL
 #define gssx_dec_release_handle NULL
 #define gssx_enc_get_mic NULL