evm: fix build problems

- Make the previously missing security_old_inode_init_security() stub
  function definition static inline.

- The stub security_inode_init_security() function previously returned
  -EOPNOTSUPP and relied on the callers to change it to 0.  The stub
  security/security_old_inode_init_security() functions now return 0.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>

include/linux/security.h

@@ -2045,14 +2045,16 @@ static inline int security_inode_init_security(struct inode *inode,
 						initxattrs initxattrs,
 						void *fs_data)
 {
-	return -EOPNOTSUPP;
+	return 0;
 }
 
-int security_old_inode_init_security(struct inode *inode, struct inode *dir,
-				     const struct qstr *qstr, char **name,
-				     void **value, size_t *len)
+static inline int security_old_inode_init_security(struct inode *inode,
+						   struct inode *dir,
+						   const struct qstr *qstr,
+						   char **name, void **value,
+						   size_t *len)
 {
-	return -EOPNOTSUPP;
+	return 0;
 }
 
 static inline int security_inode_create(struct inode *dir,