zdtm/test: add infop to waitid()

The man page says, it's not optional argument:
  The application shall ensure that the infop argument
  points to a siginfo_t structure.

Fixes:
Test output: ================================
17:40:26.128:     5: FAIL: helper_zombie_child.c:33: waitid (errno = 14 (Bad address))
17:40:26.128:     4: FAIL: helper_zombie_child.c:78: read (errno = 2 (No such file or directory))
17:40:26.129:     3: ERR: test.c:229: Test exited unexpectedly with code 1

Test output: ================================
15:30:49.021:    30: ERR: sigpending.c:213: waitid (errno = 14 (Bad address))
15:30:49.021:    29: ERR: test.c:229: Test exited unexpectedly with code 1

and etc.

travis-ci: success for 32-bit tests fixes
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Acked-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

test/zdtm/static/helper_zombie_child.c

@@ -16,6 +16,7 @@ const char *test_author	= "Tycho Andersen <tycho.andersen@canonical.com>";
 
 void setsid_and_fork(int sk)
 {
+	siginfo_t infop;
 	pid_t zombie;
 
 	setsid();
@@ -29,7 +30,7 @@ void setsid_and_fork(int sk)
 	if (zombie == 0)
 		exit(0);
 
-	if (waitid(P_PID, zombie, NULL, WNOWAIT | WEXITED) < 0) {
+	if (waitid(P_PID, zombie, &infop, WNOWAIT | WEXITED) < 0) {
 		fail("waitid");
 		exit(1);
 	}

test/zdtm/static/sigpending.c

@@ -170,6 +170,7 @@ int main(int argc, char ** argv)
 	sigset_t blockmask, oldset, newset;
 	struct sigaction act;
 	pthread_t pthrd;
+	siginfo_t infop;
 	int i;
 
 	memset(&oldset, 0, sizeof(oldset));
@@ -209,7 +210,7 @@ int main(int argc, char ** argv)
 
 	if(child == 0)
 		return 5; /* SIGCHLD */
-	if (waitid(P_PID, child, NULL, WNOWAIT | WEXITED)) {
+	if (waitid(P_PID, child, &infop, WNOWAIT | WEXITED)) {
 		pr_perror("waitid");
 		return 1;
 	}

test/zdtm/static/stopped.c

@@ -13,6 +13,7 @@ const char *test_author	= "Andrew Vagin <avagin@parallels.com>";
 int main(int argc, char **argv)
 {
 	pid_t pid;
+	siginfo_t infop;
 	int p[2], ret, status;
 
 	test_init(argc, argv);
@@ -40,7 +41,7 @@ int main(int argc, char **argv)
 	close(p[0]);
 
 	kill(pid, SIGSTOP);
-	if (waitid(P_PID, pid, NULL, WNOWAIT | WSTOPPED) < 0) {
+	if (waitid(P_PID, pid, &infop, WNOWAIT | WSTOPPED) < 0) {
 		pr_perror("waitid");
 		return 1;
 	}