Needed for hex_byte_pack().

x86_64 was already including it, but some arches were not.

Fixes: 37b0ea8fef56 ("net: expand NETDEV_RSS_KEY_LEN to 256 bytes")
Reported-by: Mark Brown <broonie@kernel.org>
Closes: https://lore.kernel.org/netdev/aXeka0KYBnrkwUcF@sirena.org.uk/
Signed-off-by: Eric Dumazet <edumazet@google.com>
---
 net/core/sysctl_net_core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index 0f761d4b9447..03aea10073f0 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -17,6 +17,7 @@
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/sched/isolation.h>
+#include <linux/hex.h>
 
 #include <net/ip.h>
 #include <net/sock.h>
-- 
2.52.0.457.g6b5491de43-goog