rxrpc: Fix defined range for /proc/sys/net/rxrpc/rx_mtu

The upper bound of the defined range for rx_mtu is being set in the same
member as the lower bound (extra1) rather than the correct place (extra2).
I'm not entirely sure why this compiles.

Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/net/rxrpc/sysctl.c b/net/rxrpc/sysctl.c
index 50a98a9..093547a 100644
--- a/net/rxrpc/sysctl.c
+++ b/net/rxrpc/sysctl.c
@@ -115,7 +115,7 @@
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= (void *)&one,
-		.extra1		= (void *)&n_65535,
+		.extra2		= (void *)&n_65535,
 	},
 	{
 		.procname	= "rx_jumbo_max",