[PATCH] lib: checksum: Fix build with CONFIG_NET=n

[Palmer Dabbelt <palmer@rivosinc.com>]

From: Palmer Dabbelt <palmer@rivosinc.com>

The generic ipv6 checksums are only defined with CONFIG_NET=y, so gate
the test as well.

Fixes: 6f4c45cbcb00 ("kunit: Add tests for csum_ipv6_magic and ip_fast_csum")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202401192143.jLdjbIy3-lkp@intel.com/
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
---
That Fixes tag is against a PR I just sent up to Linus [1], sorry for
missing this but it came in right when I was sending out the PR.

1: https://lore.kernel.org/linux-riscv/mhng-690cf774-fd28-4d25-be9f-69e19fb84d5c@palmer-ri-x1c9/T/#u
---
 lib/checksum_kunit.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/checksum_kunit.c b/lib/checksum_kunit.c
index af3e5ca4e170..225bb7701460 100644
--- a/lib/checksum_kunit.c
+++ b/lib/checksum_kunit.c
@@ -593,6 +593,7 @@ static void test_ip_fast_csum(struct kunit *test)
 
 static void test_csum_ipv6_magic(struct kunit *test)
 {
+#if defined(CONFIG_NET)
 	const struct in6_addr *saddr;
 	const struct in6_addr *daddr;
 	unsigned int len;
@@ -616,6 +617,7 @@ static void test_csum_ipv6_magic(struct kunit *test)
 		CHECK_EQ(expected_csum_ipv6_magic[i],
 			 csum_ipv6_magic(saddr, daddr, len, proto, csum));
 	}
+#endif /* !CONFIG_NET */
 }
 
 static struct kunit_case __refdata checksum_test_cases[] = {
-- 
2.43.0