Index: uspace/lib/block/block.c
===================================================================
--- uspace/lib/block/block.c	(revision 062d9000625057300f609429080872d6492b542e)
+++ uspace/lib/block/block.c	(revision aac1c41761e0243b82c3356b90847ec9e1d7df84)
@@ -255,6 +255,6 @@
 	.key_hash = cache_key_hash,
 	.key_equal = cache_key_equal,
-	.equal = 0,
-	.remove_callback = 0
+	.equal = NULL,
+	.remove_callback = NULL
 };