block: Rename qemu_aio_release -> qemu_aio_unref

Suggested-by: BenoƮt Canet <benoit.canet@irqsave.net>
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/block/linux-aio.c b/block/linux-aio.c
index b67f56c..f4baba2 100644
--- a/block/linux-aio.c
+++ b/block/linux-aio.c
@@ -88,7 +88,7 @@
     }
     laiocb->common.cb(laiocb->common.opaque, ret);
 
-    qemu_aio_release(laiocb);
+    qemu_aio_unref(laiocb);
 }
 
 /* The completion BH fetches completed I/O requests and invokes their
@@ -286,7 +286,7 @@
     return &laiocb->common;
 
 out_free_aiocb:
-    qemu_aio_release(laiocb);
+    qemu_aio_unref(laiocb);
     return NULL;
 }