testcases/kernel/syscalls: clean up old style prototypes

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/testcases/kernel/syscalls/getresgid/getresgid01.c b/testcases/kernel/syscalls/getresgid/getresgid01.c
index c6a5d16..464a504 100644
--- a/testcases/kernel/syscalls/getresgid/getresgid01.c
+++ b/testcases/kernel/syscalls/getresgid/getresgid01.c
@@ -146,7 +146,7 @@
  * setup() - performs all ONE TIME setup for this test.
  *	     Get the real/effective/saved user id of the calling process.
  */
-void setup()
+void setup(void)
 {
 
 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
@@ -168,7 +168,7 @@
  * cleanup() - performs all ONE TIME cleanup for this test at
  *             completion or premature exit.
  */
-void cleanup()
+void cleanup(void)
 {
 	/*
 	 * print timing stats if that option was specified.