net: sctp: avoid incorrect time_t use

We want to avoid using time_t in the kernel because of the y2038
overflow problem. The use in sctp is not for storing seconds at
all, but instead uses microseconds and is passed as 32-bit
on all machines.

This patch changes the type to u32, which better fits the use.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Vlad Yasevich <vyasevich@gmail.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: linux-sctp@vger.kernel.org
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sctp/sm_make_chunk.c

@@ -2494,7 +2494,7 @@ static int sctp_process_param(struct sctp_association *asoc,
 	__u16 sat;
 	int retval = 1;
 	sctp_scope_t scope;
-	time_t stale;
+	u32 stale;
 	struct sctp_af *af;
 	union sctp_addr_param *addr_param;
 	struct sctp_transport *t;

net/sctp/sm_statefuns.c

@@ -2306,7 +2306,7 @@ static sctp_disposition_t sctp_sf_do_5_2_6_stale(struct net *net,
 						 sctp_cmd_seq_t *commands)
 {
 	struct sctp_chunk *chunk = arg;
-	time_t stale;
+	u32 stale;
 	sctp_cookie_preserve_param_t bht;
 	sctp_errhdr_t *err;
 	struct sctp_chunk *reply;