Fix null i2c_dev access for SPI case

adafruit / Adafruit_SH110x

Arduino library for SH110x based monochrome OLEDs

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Fix null i2c_dev access for SPI case #11

Closed caternuson closed 2 years ago

caternuson commented 2 years ago

For #10. Untested, but seems like an obvious issue and simple fix. maxbuff is only used locally inside the if (i2c_dev) { block, so just move it there. Otherwise an attempt will be made to access i2c_dev for SPI configurations.