c6x: add ret_from_kernel_thread(), simplify kernel_thread()
Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>