staging: iio: meter: add check on return variables

adds checks on variables that are used to return values. If
the value is less than zero, this indicates that an error
occurred and hence a message is printed through dev_err.
Checks are made on negative values only since spi_* functions
return negative error codes.

The functions were found using the following script but the
aforementioned modification was what was carried out in the end:
@@
identifier len,f;
@@

-int len;
... when != len
when strict
-len =
+return
f(...);
-return len;

Signed-off-by: Aya Mahfouz <[e-mail]>
Reviewed-by: Daniel Baluta <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/iio/meter/ade7758_core.c

···
 	int ret;
 	u8 val;
 
-	ade7758_spi_read_reg_8(dev,
-			ADE7758_OPMODE,
-			&val);
+	ret = ade7758_spi_read_reg_8(dev, ADE7758_OPMODE, &val);
+	if (ret < 0) {
+		dev_err(dev, "Failed to read opmode reg\n");
+		return ret;
+	}
 	val |= 1 << 6; /* Software Chip Reset */
-	ret = ade7758_spi_write_reg_8(dev,
-			ADE7758_OPMODE,
-			val);
-
+	ret = ade7758_spi_write_reg_8(dev, ADE7758_OPMODE, val);
+	if (ret < 0)
+		dev_err(dev, "Failed to write opmode reg\n");
 	return ret;
 }
 
···
 	int ret;
 	u8 val;
 
-	ade7758_spi_read_reg_8(dev,
-			ADE7758_OPMODE,
-			&val);
+	ret = ade7758_spi_read_reg_8(dev, ADE7758_OPMODE, &val);
+	if (ret < 0) {
+		dev_err(dev, "Failed to read opmode reg\n");
+		return ret;
+	}
 	val |= 7 << 3;  /* ADE7758 powered down */
-	ret = ade7758_spi_write_reg_8(dev,
-			ADE7758_OPMODE,
-			val);
-
+	ret = ade7758_spi_write_reg_8(dev, ADE7758_OPMODE, val);
+	if (ret < 0)
+		dev_err(dev, "Failed to write opmode reg\n");
 	return ret;
 }