gpio/tca6424: merge I2C transactions, remove cast
This is a follow-up to ae79c190 "[PATCH v2] Add support for TCA6424" merged in the v3.5 merge window. It fixes comments made when the patch was merged. - Use 3 byte transfers instead of two separate transfers (2+1 byte) - An unnecessary cast removed Signed-off-by: NAndreas Schallenberg <Andreas.Schallenberg@3alitytechnica.com> Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
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