evm: remove unused cleanup functions

EVM cannot be built as a kernel module. Remove the unncessary __exit
functions.

Signed-off-by: Dmitry Kasatkin <[e-mail]>
Signed-off-by: Mimi Zohar <[e-mail]>

security/integrity/evm/evm.h

···
 extern int evm_init_hmac(struct inode *inode, const struct xattr *xattr,
 			 char *hmac_val);
 extern int evm_init_secfs(void);
-extern void evm_cleanup_secfs(void);
 
 #endif

security/integrity/evm/evm_main.c

···
 	return error;
 }
 
-static void __exit cleanup_evm(void)
-{
-	evm_cleanup_secfs();
-	if (hmac_tfm)
-		crypto_free_shash(hmac_tfm);
-	if (hash_tfm)
-		crypto_free_shash(hash_tfm);
-}
-
 /*
  * evm_display_config - list the EVM protected security extended attributes
  */

security/integrity/evm/evm_secfs.c

···
 		error = -EFAULT;
 	return error;
 }
-
-void __exit evm_cleanup_secfs(void)
-{
-	if (evm_init_tpm)
-		securityfs_remove(evm_init_tpm);
-}