i2c-algo-pca: Remove trailing whitespaces and unnecessary UTF

Remove trailing whitespaces to make further patches more readable.  Also remove
an unnecessary UTF-char for simplicity ("us" for microseconds is fine enough).
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

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

@@ -350,7 +350,7 @@ static int pca_init(struct i2c_algo_pca_data *adap)
 	pca_outw(adap, I2C_PCA_ADR, own << 1);
 
 	pca_set_con(adap, I2C_PCA_CON_ENSIO | clock);
-	udelay(500); /* 500 µs for oscilator to stabilise */
+	udelay(500); /* 500 us for oscilator to stabilise */
 
 	return 0;
 }