[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: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm_pci.c b/drivers/scsi/aic7xxx/aic7xxx_osm_pci.c
index cb30d9c..0c9c2f4 100644
--- a/drivers/scsi/aic7xxx/aic7xxx_osm_pci.c
+++ b/drivers/scsi/aic7xxx/aic7xxx_osm_pci.c
@@ -219,6 +219,7 @@
 		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);
 		}