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Changes:
o Added permission checks for installing. CAP_SYS_ADMIN and
CAP_SYS_TTY_CONFIG can install the ldisc.
o Check if allocation of skb was successful.
Signed-off-by: Sjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>