i2c-algo-pca: Fix use of uninitialized variable in debug message

A recent change broke debugging of pca_xfer(), fix it.
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>

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

@@ -190,7 +190,7 @@ static int pca_xfer(struct i2c_adapter *i2c_adap,
 	int completed = 1;
 	unsigned long timeout = jiffies + i2c_adap->timeout;
 
-	while (pca_status(adap) != 0xf8) {
+	while ((state = pca_status(adap)) != 0xf8) {
 		if (time_before(jiffies, timeout)) {
 			msleep(10);
 		} else {