- save 4 bytes

text    data     bss     dec     hex filename
    764       0      80     844     34c vlock.o.oorig
    760       0      80     840     348 vlock.o

loginutils/vlock.c

@@ -114,5 +114,5 @@ int vlock_main(int argc, char **argv)
 		puts("Password incorrect");
 	} while (1);
 	restore_terminal();
-	return 0;
+	fflush_stdout_and_exit(0);
 }