i2c: core: Fix spacing error by checkpatch

Fix the following checkpatch error:
 torvalds#614: FILE: drivers/i2c/i2c-core-base.c:614:
 +	len = acpi_device_modalias(dev, buf, PAGE_SIZE -1);
 	                                               ^
No functional changes.

Signed-off-by: Tian Tao <[email protected]>

drivers/i2c/i2c-core-base.c

@@ -612,7 +612,7 @@ modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 	if (len != -ENODEV)
 		return len;
 
-	len = acpi_device_modalias(dev, buf, PAGE_SIZE -1);
+	len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1);
 	if (len != -ENODEV)
 		return len;