fscrypt: make ->dummy_context() return bool

This makes it consistent with ->is_encrypted(), ->empty_dir(), and
fscrypt_dummy_context_enabled().

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/include/linux/fscrypt_common.h b/include/linux/fscrypt_common.h
index 4022c61..e3e1208 100644
--- a/include/linux/fscrypt_common.h
+++ b/include/linux/fscrypt_common.h
@@ -77,7 +77,7 @@ struct fscrypt_operations {
 	const char *key_prefix;
 	int (*get_context)(struct inode *, void *, size_t);
 	int (*set_context)(struct inode *, const void *, size_t, void *);
-	int (*dummy_context)(struct inode *);
+	bool (*dummy_context)(struct inode *);
 	bool (*is_encrypted)(struct inode *);
 	bool (*empty_dir)(struct inode *);
 	unsigned (*max_namelen)(struct inode *);