w1 - fix fops in w1_bus_notify
Introduce a check to make sure that fops are only called if they have been defined by the slave module. Without this check modules like w1_smem cause a NULL pointer dereference bug. Signed-off by: Hans-Frieder Vogt <hfvogt@gmx.net> Acked-by: NEvgeniy Polyakov <zbr@ioremap.net> Cc: stable <stable@vger.kernel.org> # 3.11+ Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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