3.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Julia Lawall <[email protected]>

commit e9ed104de68c345c9a827225e93c74c6894613a9 upstream.

iio_kfifo_allocate returns NULL in case of error.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression *x;
identifier f;
statement S1,S2;
@@

*x = f(...);
 if (x) { <+... when != if (...) S1 else S2
     -ENOMEM ...+> }
// </smpl>

Signed-off-by: Julia Lawall <[email protected]>
Signed-off-by: Jonathan Cameron <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

---
 drivers/staging/iio/impedance-analyzer/ad5933.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/staging/iio/impedance-analyzer/ad5933.c
+++ b/drivers/staging/iio/impedance-analyzer/ad5933.c
@@ -629,7 +629,7 @@ static int ad5933_register_ring_funcs_an
        struct iio_buffer *buffer;
 
        buffer = iio_kfifo_allocate(indio_dev);
-       if (buffer)
+       if (!buffer)
                return -ENOMEM;
 
        iio_device_attach_buffer(indio_dev, buffer);


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