[PATCH 1/2] iio: meter: ade7754: fix build warnings with make randconfig

[Devendra Naga <devendra.aaru@gmail.com>]

fixes

drivers/staging/iio/meter/ade7754.c:222:6: warning: ‘val’ may be used
uninitialized in this function [-Wmaybe-uninitialized]
drivers/staging/iio/meter/ade7754.c:368:6: warning: ‘val’ may be used
uninitialized in this function [-Wmaybe-uninitialized]

the fix here is to check the return value of ade7754_spi_read_reg_8.

Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
---

 hapens on next-20141215 with make randconfig. compile tested only on x86_64.

 drivers/staging/iio/meter/ade7754.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/iio/meter/ade7754.c b/drivers/staging/iio/meter/ade7754.c
index 81f6731..9e71575 100644
--- a/drivers/staging/iio/meter/ade7754.c
+++ b/drivers/staging/iio/meter/ade7754.c
@@ -216,9 +216,13 @@ error_ret:
 
 static int ade7754_reset(struct device *dev)
 {
+	int ret;
 	u8 val;
 
-	ade7754_spi_read_reg_8(dev, ADE7754_OPMODE, &val);
+	ret = ade7754_spi_read_reg_8(dev, ADE7754_OPMODE, &val);
+	if (ret < 0)
+		return ret;
+
 	val |= 1 << 6; /* Software Chip Reset */
 	return ade7754_spi_write_reg_8(dev, ADE7754_OPMODE, val);
 }
@@ -362,9 +366,13 @@ error_ret:
 /* Power down the device */
 static int ade7754_stop_device(struct device *dev)
 {
+	int ret;
 	u8 val;
 
-	ade7754_spi_read_reg_8(dev, ADE7754_OPMODE, &val);
+	ret = ade7754_spi_read_reg_8(dev, ADE7754_OPMODE, &val);
+	if (ret < 0)
+		return ret;
+
 	val |= 7 << 3;  /* ADE7754 powered down */
 	return ade7754_spi_write_reg_8(dev, ADE7754_OPMODE, val);
 }
-- 
2.1.0