sctp: chunk.c: correct format string for size_t in printk

According to Documentation/core-api/printk-formats.rst, size_t should be
printed with %zu, rather than %Zu.

In addition, using %Zu triggers a warning on clang (-Wformat-extra-args):

net/sctp/chunk.c:196:25: warning: data argument not used by format string [-Wformat-extra-args]
                                    __func__, asoc, max_data);
                                    ~~~~~~~~~~~~~~~~^~~~~~~~~
./include/linux/printk.h:440:49: note: expanded from macro 'pr_warn_ratelimited'
        printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
./include/linux/printk.h:424:17: note: expanded from macro 'printk_ratelimited'
                printk(fmt, ##__VA_ARGS__);                             \
                       ~~~    ^

Fixes: 5b5e092 ("lib/vsprintf.c: remove %Z support")
Link: ClangBuiltLinux/linux#378
Signed-off-by: Matthias Maennich <maennich@google.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sctp/chunk.c

@@ -192,7 +192,7 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
 	if (unlikely(!max_data)) {
 		max_data = sctp_min_frag_point(sctp_sk(asoc->base.sk),
 					       sctp_datachk_len(&asoc->stream));
-		pr_warn_ratelimited("%s: asoc:%p frag_point is zero, forcing max_data to default minimum (%Zu)",
+		pr_warn_ratelimited("%s: asoc:%p frag_point is zero, forcing max_data to default minimum (%zu)",
 				    __func__, asoc, max_data);
 	}