isdn: l3ni1: Fix set-but-unused variables.
The variable 'cause' is set but unused in ni1up(). Just
kill it off.
Signed-off-by: 
David S. Miller <davem@davemloft.net>
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The variable 'cause' is set but unused in ni1up(). Just
kill it off.
Signed-off-by: David S. Miller <davem@davemloft.net>