Fix mistake.

lib/i2c.h

@@ -29,5 +29,5 @@ void i2c_master_init(void);
 t_i2c_status  i2c_wr_data(uint8_t address, uint8_t num_bytes_to_wr, uint8_t * data);
 
 // Read 3 bytes
-t_i2c_status  i2c_rd_data(uint8_t address, uint8_t num_bytes_to_rw, uint8_t * data);
+t_i2c_status  i2c_rd_data(uint8_t address, uint8_t num_bytes_to_rd, uint8_t * data);
 #endif // I2C_H