solos-pci: fix error return code

Convert a zero return value on error to a negative one, as returned
elsewhere in the function.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier ret; expression e1,e2;
@@
(
if (\(ret < 0\|ret != 0\))
 { ... return ret; }
|
ret = 0
)
... when != ret = e1
    when != &ret
*if(...)
{
  ... when != ret = e2
      when forall
 return ret;
}
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Acked-by: Chas Williams <chas@cmf.nrl.navy.mil>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/atm/solos-pci.c

@@ -1278,6 +1278,7 @@ static int fpga_probe(struct pci_dev *dev, const struct pci_device_id *id)
 			card->dma_bounce = kmalloc(card->nr_ports * BUF_SIZE, GFP_KERNEL);
 			if (!card->dma_bounce) {
 				dev_warn(&card->dev->dev, "Failed to allocate DMA bounce buffers\n");
+				err = -ENOMEM;
 				/* Fallback to MMIO doesn't work */
 				goto out_unmap_both;
 			}