dm: rtc: Correct rtc_read32() return value
The current check is incorrect and will fail when any non-zero byte is read.
Fix it.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/rtc/rtc-uclass.c b/drivers/rtc/rtc-uclass.c
index fe74c69..300e9b3 100644
--- a/drivers/rtc/rtc-uclass.c
+++ b/drivers/rtc/rtc-uclass.c
@@ -68,7 +68,7 @@
for (i = 0; i < sizeof(value); i++) {
ret = rtc_read8(dev, reg + i);
- if (ret)
+ if (ret < 0)
return ret;
value |= ret << (i << 3);
}