integrity: add missing '__init' keyword for integrity_init_keyring()

integrity_init_keyring() is used only from kernel '__init'
functions. Add it there as well.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h
index 883a5fc..f51ad65 100644
--- a/security/integrity/integrity.h
+++ b/security/integrity/integrity.h
@@ -129,7 +129,7 @@
 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
 			    const char *digest, int digestlen);
 
-int integrity_init_keyring(const unsigned int id);
+int __init integrity_init_keyring(const unsigned int id);
 #else
 
 static inline int integrity_digsig_verify(const unsigned int id,