From upstream 8454c93fa37ce9f3c8becc7004a2edddba22f3a1.

Index: src/path.h
--- src/path.h.orig
+++ src/path.h
@@ -375,7 +375,7 @@ class PathInfo (public)
 				else if (strchr(strftimeArgs, *p))
 				{
 					char tmp[MAX_PATH];
-					char format[] = { '%', *p, NULL };
+					char format[] = { '%', *p, '\0' };
 					strftime(tmp, MAX_PATH, format, time_struct);
 					file.append(tmp);
 		}