rtc: rv8803: fix handling return value of i2c_smbus_read_byte_data

The function can return negative values, so its result should
be assigned to signed variable.

The problem has been detected using proposed semantic patch
scripts/coccinelle/tests/assign_signed_to_unsigned.cocci [1].

[1]: http://permalink.gmane.org/gmane.linux.kernel/2046107

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c
index e7329e2..f883aa2 100644 (file)
--- a/drivers/rtc/rtc-rv8803.c
+++ b/drivers/rtc/rtc-rv8803.c
@@ -61,7 +61,7 @@ static irqreturn_t rv8803_handle_irq(int irq, void *dev_id)
        struct i2c_client *client = dev_id;
        struct rv8803_data *rv8803 = i2c_get_clientdata(client);
        unsigned long events = 0;
-       u8 flags;
+       int flags;
 
        spin_lock(&rv8803->flags_lock);