[PATCH v2 06/44] qemu-option: Check return value instead of @err where convenient

[Markus Armbruster <armbru@redhat.com>]

Convert uses like

    opts = qemu_opts_create(..., &err);
    if (err) {
        ...
    }

to

    opts = qemu_opts_create(..., &err);
    if (!opts) {
        ...
    }

Eliminate error_propagate() that are now unnecessary.  Delete @err
that are now unused.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 block/parallels.c  |  4 ++--
 blockdev.c         |  5 ++---
 qdev-monitor.c     |  5 ++---
 util/qemu-config.c | 10 ++++------
 util/qemu-option.c | 12 ++++--------
 5 files changed, 14 insertions(+), 22 deletions(-)

diff --git a/block/parallels.c b/block/parallels.c
index 63a1cde8af..f26f03c926 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -824,8 +824,8 @@ static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
         }
     }
 
-    opts = qemu_opts_create(&parallels_runtime_opts, NULL, 0, &local_err);
-    if (local_err != NULL) {
+    opts = qemu_opts_create(&parallels_runtime_opts, NULL, 0, errp);
+    if (!opts) {
         goto fail_options;
     }
 
diff --git a/blockdev.c b/blockdev.c
index 31d5eaf6bf..b52ed9de86 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -504,9 +504,8 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
     /* Check common options by copying from bs_opts to opts, all other options
      * stay in bs_opts for processing by bdrv_open(). */
     id = qdict_get_try_str(bs_opts, "id");
-    opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
-    if (error) {
-        error_propagate(errp, error);
+    opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, errp);
+    if (!opts) {
         goto err_no_opts;
     }
 
diff --git a/qdev-monitor.c b/qdev-monitor.c
index 13a13a811a..079cb6001e 100644
--- a/qdev-monitor.c
+++ b/qdev-monitor.c
@@ -799,9 +799,8 @@ void qmp_device_add(QDict *qdict, QObject **ret_data, Error **errp)
     QemuOpts *opts;
     DeviceState *dev;
 
-    opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
+    opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict, errp);
+    if (!opts) {
         return;
     }
     if (!monitor_cur_is_qmp() && qdev_device_help(opts)) {
diff --git a/util/qemu-config.c b/util/qemu-config.c
index 772f5a219e..c0d0e9b8ef 100644
--- a/util/qemu-config.c
+++ b/util/qemu-config.c
@@ -493,9 +493,8 @@ static void config_parse_qdict_section(QDict *options, QemuOptsList *opts,
         goto out;
     }
 
-    subopts = qemu_opts_create(opts, NULL, 0, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
+    subopts = qemu_opts_create(opts, NULL, 0, errp);
+    if (!subopts) {
         goto out;
     }
 
@@ -538,10 +537,9 @@ static void config_parse_qdict_section(QDict *options, QemuOptsList *opts,
             }
 
             opt_name = g_strdup_printf("%s.%u", opts->name, i++);
-            subopts = qemu_opts_create(opts, opt_name, 1, &local_err);
+            subopts = qemu_opts_create(opts, opt_name, 1, errp);
             g_free(opt_name);
-            if (local_err) {
-                error_propagate(errp, local_err);
+            if (!subopts) {
                 goto out;
             }
 
diff --git a/util/qemu-option.c b/util/qemu-option.c
index 0ebfd97a98..fd1fd23521 100644
--- a/util/qemu-option.c
+++ b/util/qemu-option.c
@@ -670,11 +670,9 @@ void qemu_opts_set(QemuOptsList *list, const char *id,
                    const char *name, const char *value, Error **errp)
 {
     QemuOpts *opts;
-    Error *local_err = NULL;
 
-    opts = qemu_opts_create(list, id, 1, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
+    opts = qemu_opts_create(list, id, 1, errp);
+    if (!opts) {
         return;
     }
     qemu_opt_set(opts, name, value, errp);
@@ -1012,10 +1010,8 @@ QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict,
     QemuOpts *opts;
     const QDictEntry *entry;
 
-    opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1,
-                            &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
+    opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1, errp);
+    if (!opts) {
         return NULL;
     }
 
-- 
2.26.2