mfd: madera: Fix potential uninitialised use of variable

regmap_read won't set val to anything if an ACKed bus fails.
Signed-off-by: Stuart Henderson <stuarth@opensource.cirrus.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/madera-core.c

@@ -139,7 +139,7 @@ EXPORT_SYMBOL_GPL(madera_name_from_type);
 static int madera_wait_for_boot(struct madera *madera)
 {
 	ktime_t timeout;
-	unsigned int val;
+	unsigned int val = 0;
 	int ret = 0;
 
 	/*