Don't return but _exit after failed exec*() and fork()

Quoting POSIX[0]:
"Care should be taken, also, to call _exit() rather than exit() if exec cannot be used, since
exit() flushes and closes standard I/O channels, thereby damaging the parent process' standard
I/O data structures. (Even with fork(), it is wrong to call exit(), since buffered data would
then be flushed twice.)"

[0]: http://pubs.opengroup.org/onlinepubs/009695399/functions/vfork.html

time.c

@@ -41,11 +41,12 @@ main(int argc, char *argv[])
 
 	switch ((pid = fork())) {
 	case -1:
-		eprintf("fork:");
+		weprintf("fork:");
+		_exit(1);
 	case 0:
 		execvp(argv[0], argv);
 		savederrno = errno;
-		weprintf("exec %s:", argv[0]);
+		weprintf("execvp %s:", argv[0]);
 		_exit(126 + (savederrno == ENOENT));
 	default:
 		break;