um: don't bother with passing sp to do_fork() for fork(2)/vfork(2)
copy_thread() on um will do the right thing when getting 0 for sp...
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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copy_thread() on um will do the right thing when getting 0 for sp...
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>