of/i2c: call i2c_verify_client from of_find_i2c_device_by_node
i2c_bus_type may contain both I2C clients and I2C adapters. Fix of_find_i2c_device_by_node to call i2c_verify_client to ensure that it only returns non-NULL of I2C clients. Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
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