port: Remove unneeded casts of zero.

[Francois Gouget]

---
 libs/port/getopt.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/libs/port/getopt.c b/libs/port/getopt.c
index be82779..041bef0 100644
--- a/libs/port/getopt.c
+++ b/libs/port/getopt.c
@@ -1203,8 +1203,8 @@ getopt (argc, argv, optstring)
      const char *optstring;
 {
   return _getopt_internal (argc, argv, optstring,
-			   (const struct option *) 0,
-			   (int *) 0,
+			   NULL,
+			   NULL,
 			   0);
 }
 
-- 
1.5.6.5