No need to mention which memory allocation entry point failed (malloc,

calloc or strdup), we just need to log that we ran out of memory in a
particular function.
Recommended by florian@ and deraadt@
ok benno@ henning@ tb@

src/usr.sbin/ntpd/parse.y

@@ -1,4 +1,4 @@
-/*	$OpenBSD: parse.y,v 1.68 2018/07/08 17:15:07 krw Exp $ */
+/*	$OpenBSD: parse.y,v 1.69 2018/07/09 12:05:11 krw Exp $ */
 
 /*
  * Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
@@ -733,16 +733,16 @@ pushfile(const char *name)
 	struct file	*nfile;
 
 	if ((nfile = calloc(1, sizeof(struct file))) == NULL) {
-		log_warn("calloc");
+		log_warn("%s", __func__);
 		return (NULL);
 	}
 	if ((nfile->name = strdup(name)) == NULL) {
-		log_warn("strdup");
+		log_warn("%s", __func__);
 		free(nfile);
 		return (NULL);
 	}
 	if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
-		log_warn("%s", nfile->name);
+		log_warn("%s: %s", __func__, nfile->name);
 		free(nfile->name);
 		free(nfile);
 		return (NULL);