[PULL 17/17] block/qcow2: refactor qcow2_update_options_prepare error paths

[Eric Blake <eblake@redhat.com>]

From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

Keep setting ret close to setting errp and don't merge different error
paths into one. This way it's more obvious that we don't return
error without setting errp.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Message-Id: <20210202124956.63146-15-vsementsov@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
---
 block/qcow2.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/block/qcow2.c b/block/qcow2.c
index a1dee95dea6c..0db1227ac909 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1158,6 +1158,10 @@ static int qcow2_update_options_prepare(BlockDriverState *bs,
         }
         qdict_put_str(encryptopts, "format", "qcow");
         r->crypto_opts = block_crypto_open_opts_init(encryptopts, errp);
+        if (!r->crypto_opts) {
+            ret = -EINVAL;
+            goto fail;
+        }
         break;

     case QCOW_CRYPT_LUKS:
@@ -1170,14 +1174,15 @@ static int qcow2_update_options_prepare(BlockDriverState *bs,
         }
         qdict_put_str(encryptopts, "format", "luks");
         r->crypto_opts = block_crypto_open_opts_init(encryptopts, errp);
+        if (!r->crypto_opts) {
+            ret = -EINVAL;
+            goto fail;
+        }
         break;

     default:
         error_setg(errp, "Unsupported encryption method %d",
                    s->crypt_method_header);
-        break;
-    }
-    if (s->crypt_method_header != QCOW_CRYPT_NONE && !r->crypto_opts) {
         ret = -EINVAL;
         goto fail;
     }
-- 
2.30.1