i2c.c: fix typo in mraa_i2c_read_word_data
i2c.c: fix typo in mraa_i2c_read_word_data

Fixes #45

Signed-off-by: Brendan Le Foll <3e0e8c4069934e8b47d99704927a85c66c0ceb33@intel.com>

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