Move problem 1-2 (join) into project 2 as the "wait" system call.

[pintos-anon] / grading / userprog / create-bad-ptr.exp

(create-bad-ptr) begin
(create-bad-ptr) end
create-bad-ptr: exit(0)
--OR--
(create-bad-ptr) begin
create-bad-ptr: exit(-1)