Fix compilation warnings by adding unistd.h #include and missing return

statements

MFC after: 3 days
Sponsored by: EMC / Isilon Storage Division

tools/regression/tls/ttls2/ttls2.c

@@ -1,7 +1,8 @@
 /* $FreeBSD$ */
 
-#include <stdio.h>
 #include <pthread.h>
+#include <stdio.h>
+#include <unistd.h>
 
 int __thread i;
 
@@ -13,6 +14,7 @@ foo1(void *arg)
 		printf("thread %p, i = %d\n", pthread_self(), i);
 		sleep(1);
 	}
+	return (NULL);
 }
 
 void *
@@ -23,9 +25,11 @@ foo2(void *arg)
 		printf("thread %p, i = %d\n", pthread_self(), i);
 		sleep(1);
 	}
+	return (NULL);
 }
 
-int main(int argc, char** argv)
+int
+main(int argc, char** argv)
 {
 	pthread_t t1, t2;
 
@@ -33,4 +37,6 @@ int main(int argc, char** argv)
 	pthread_create(&t2, 0, foo2, 0);
 	pthread_join(t1, 0);
 	pthread_join(t2, 0);
+
+	return (0);
 }