Index: uspace/app/trace/ipcp.c
===================================================================
--- uspace/app/trace/ipcp.c	(revision 062d9000625057300f609429080872d6492b542e)
+++ uspace/app/trace/ipcp.c	(revision e8a15308520eb5e8ccf7d9faaff7cc85ce11be74)
@@ -98,6 +98,6 @@
 	.key_hash = pending_call_key_hash,
 	.key_equal = pending_call_key_equal,
-	.equal = 0,
-	.remove_callback = 0
+	.equal = NULL,
+	.remove_callback = NULL
 };