[SCSI] SCSI: aic7xxx_osm_pci resource leak fix.

Fix resource leak in
drivers/scsi/aic7xxx/aic7xxx_osm_pci.c::ahc_linux_pci_dev_probe()

Found by the coverity checker (#668)
Signed-off-by: NJesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/aic7xxx/aic7xxx_osm_pci.c

@@ -219,6 +219,7 @@ ahc_linux_pci_dev_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		ahc->flags |= AHC_39BIT_ADDRESSING;
 	} else {
 		if (dma_set_mask(dev, DMA_32BIT_MASK)) {
+			ahc_free(ahc);
 			printk(KERN_WARNING "aic7xxx: No suitable DMA available.\n");
                 	return (-ENODEV);
 		}