Index: uspace/lib/c/generic/async.c
===================================================================
--- uspace/lib/c/generic/async.c	(revision 062d9000625057300f609429080872d6492b542e)
+++ uspace/lib/c/generic/async.c	(revision dcb07513e66a1ecb603d6f380ffee05fa3b4e187)
@@ -416,6 +416,6 @@
 	.key_hash = client_key_hash,
 	.key_equal = client_key_equal,
-	.equal = 0,
-	.remove_callback = 0
+	.equal = NULL,
+	.remove_callback = NULL
 };
 
@@ -452,6 +452,6 @@
 	.key_hash = conn_key_hash,
 	.key_equal = conn_key_equal,
-	.equal = 0,
-	.remove_callback = 0
+	.equal = NULL,
+	.remove_callback = NULL
 };