qcow2: remove memory leak

Signed-off-by: Frediano Ziglio <freddy77@gmail.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

block/qcow2.c

diff --git a/block/qcow2.c b/block/qcow2.c
index 37dab65..b725d68 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -496,6 +496,7 @@
     qemu_co_mutex_unlock(&s->lock);
 
     qemu_iovec_destroy(&hd_qiov);
+    g_free(cluster_data);
 
     return ret;
 }
@@ -608,6 +609,7 @@
     qemu_co_mutex_unlock(&s->lock);
 
     qemu_iovec_destroy(&hd_qiov);
+    g_free(cluster_data);
 
     return ret;
 }