media: ar0521: Use %pe format specifier

The %pe format specifier is designed to print error pointers. It prints
a symbolic error name (eg. -EINVAL) and it makes the code simpler by
omitting PTR_ERR()

This patch fixes this cocci report:
./i2c/ar0521.c:1113:31-38: WARNING: Consider using %pe to print PTR_ERR()

Signed-off-by: Ricardo Ribalda <[e-mail]>
Acked-by: Krzysztof Hałasa <[e-mail]>
Acked-by: Sakari Ailus <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/i2c/ar0521.c

···
 						ar0521_supply_names[cnt]);
 
 		if (IS_ERR(supply)) {
-			dev_info(dev, "no %s regulator found: %li\n",
-				 ar0521_supply_names[cnt], PTR_ERR(supply));
+			dev_info(dev, "no %s regulator found: %pe\n",
+				 ar0521_supply_names[cnt], supply);
 			return PTR_ERR(supply);
 		}
 		sensor->supplies[cnt] = supply;