devpts: propagate error code from devpts_pty_new
Have ptmx_open() propagate any error code returned by devpts_pty_new() (which returns either 0 or -ENOMEM anyway). Signed-off-by: NSukadev Bhattiprolu <sukadev@us.ibm.com> Acked-by: NSerge Hallyn <serue@us.ibm.com> Acked-by: NH. Peter Anvin <hpa@zytor.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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