nvme: Fix memleak in nvme_dma_read_prp

Signed-off-by: NLu Lina <lina.lulina@huawei.com>
Acked-by: NKeith Busch <keith.busch@intel.com>
Message-id: 1434695254-69808-1-git-send-email-kathy.wangting@huawei.com
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>

hw/block/nvme.c

@@ -154,6 +154,7 @@ static uint16_t nvme_dma_read_prp(NvmeCtrl *n, uint8_t *ptr, uint32_t len,
         qemu_sglist_destroy(&qsg);
         return NVME_INVALID_FIELD | NVME_DNR;
     }
+    qemu_sglist_destroy(&qsg);
     return NVME_SUCCESS;
 }