Fix printing of struct statfs.f_flags

* print_statfs.c (print_statfs_flags): Print flags using printflags64.
diff --git a/print_statfs.c b/print_statfs.c
index 17f4c6f..d5478eb 100644
--- a/print_statfs.c
+++ b/print_statfs.c
@@ -46,7 +46,7 @@
 {
 	if (flags & ST_VALID) {
 		tprints(prefix);
-		printflags(statfs_flags, flags, "ST_???");
+		printflags64(statfs_flags, flags, "ST_???");
 	}
 }