Remove useless casts.

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
diff --git a/testcases/kernel/syscalls/swapon/swapon03.c b/testcases/kernel/syscalls/swapon/swapon03.c
index 234e03b..084c16c 100644
--- a/testcases/kernel/syscalls/swapon/swapon03.c
+++ b/testcases/kernel/syscalls/swapon/swapon03.c
@@ -110,7 +110,7 @@
 	int lc;			/* loop counter */
 	char *msg;		/* message returned from parse_opts */
 
-	if ((msg = parse_opts(ac, av, (option_t *) NULL, NULL)) != NULL)
+	if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL)
 		tst_brkm(TBROK, tst_exit, "OPTION PARSING ERROR - %s", msg);
 
 	/***************************************************************