fix typo "definetly" -> "definitely" in comment

Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

drivers/i2c/algos/i2c-algo-pcf.c

@@ -176,7 +176,7 @@ static int pcf_init_8584 (struct i2c_algo_pcf_data *adap)
 	 */
 	if (((temp = get_pcf(adap, 1)) & 0x7f) != (0)) {
 		DEB2(printk(KERN_ERR "i2c-algo-pcf.o: PCF detection failed -- can't select S0 (0x%02x).\n", temp));
-		return -ENXIO; /* definetly not PCF8584 */
+		return -ENXIO; /* definitely not PCF8584 */
 	}
 
 	/* load own address in S0, effective address is (own << 1) */