[PATCH] cert: Add kconfig dependency for validate_trust

[Eric Snowberg]

The kernel test robot reports when building with Kconfig
CONFIG_INTEGRITY_PLATFORM_KEYRING defined and 
CONFIG_SYSTEM_DATA_VERIFICATION undefined:

ld.lld: error: undefined symbol: pkcs7_validate_trust
referenced by blacklist.c:128 (certs/blacklist.c:128)
             blacklist.o:(is_key_on_revocation_list) in archive certs/built-in.a

Make CONFIG_SYSTEM_DATA_VERIFICATION a dependency for validate_trust.

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Eric Snowberg <eric.snowberg@xxxxxxxxxx>
---
 certs/blacklist.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/certs/blacklist.h b/certs/blacklist.h
index 420bb7c86e07..a86f0b52a033 100644
--- a/certs/blacklist.h
+++ b/certs/blacklist.h
@@ -4,7 +4,7 @@
 
 extern const char __initconst *const blacklist_hashes[];
 
-#ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING
+#if defined(CONFIG_INTEGRITY_PLATFORM_KEYRING) && defined(SYSTEM_DATA_VERIFICATION)
 #define validate_trust pkcs7_validate_trust
 #else
 static inline int validate_trust(struct pkcs7_message *pkcs7,
-- 
2.18.4