sheepdog: fix resource leak with sd_snapshot_create

Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

block/sheepdog.c

diff --git a/block/sheepdog.c b/block/sheepdog.c
index 2d5f06a..bd7cbed 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -2341,6 +2341,7 @@
     if (ret < 0) {
         error_report("failed to create inode for snapshot: %s",
                      error_get_pretty(local_err));
+        error_free(local_err);
         goto cleanup;
     }