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

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

From: Hartmut Knaack <knaac...@gmx.de>

commit 38408d056188be29a6c4e17f3703c796551bb330 upstream.

Only free an IRQ in error_free_irq, if it has been requested previously.

Signed-off-by: Hartmut Knaack <knaac...@gmx.de>
Acked-by: Lars-Peter Clausen <l...@metafoo.de>
Signed-off-by: Jonathan Cameron <ji...@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/staging/iio/adc/ad799x_core.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/staging/iio/adc/ad799x_core.c
+++ b/drivers/staging/iio/adc/ad799x_core.c
@@ -588,7 +588,8 @@ static int ad799x_probe(struct i2c_clien
        return 0;
 
 error_free_irq:
-       free_irq(client->irq, indio_dev);
+       if (client->irq > 0)
+               free_irq(client->irq, indio_dev);
 error_cleanup_ring:
        ad799x_ring_cleanup(indio_dev);
 error_disable_reg:


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