block/monitor: Consolidate hmp_handle_error calls to reduce redundant…

… code

Signed-off-by: Mao Zhongyi <maozhongyi@cmss.chinamobile.com>
Message-Id: <20210802062507.347555-1-maozhongyi@cmss.chinamobile.com>
Signed-off-by: Hanna Reitz <hreitz@redhat.com>

block/monitor/block-hmp-cmds.c

@@ -251,10 +251,10 @@ void hmp_drive_mirror(Monitor *mon, const QDict *qdict)
 
     if (!filename) {
         error_setg(&err, QERR_MISSING_PARAMETER, "target");
-        hmp_handle_error(mon, err);
-        return;
+        goto end;
     }
     qmp_drive_mirror(&mirror, &err);
+end:
     hmp_handle_error(mon, err);
 }
 
@@ -281,11 +281,11 @@ void hmp_drive_backup(Monitor *mon, const QDict *qdict)
 
     if (!filename) {
         error_setg(&err, QERR_MISSING_PARAMETER, "target");
-        hmp_handle_error(mon, err);
-        return;
+        goto end;
     }
 
     qmp_drive_backup(&backup, &err);
+end:
     hmp_handle_error(mon, err);
 }
 
@@ -356,15 +356,15 @@ void hmp_snapshot_blkdev(Monitor *mon, const QDict *qdict)
          * will be taken internally. Today it's actually required.
          */
         error_setg(&err, QERR_MISSING_PARAMETER, "snapshot-file");
-        hmp_handle_error(mon, err);
-        return;
+        goto end;
     }
 
     mode = reuse ? NEW_IMAGE_MODE_EXISTING : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
     qmp_blockdev_snapshot_sync(true, device, false, NULL,
                                filename, false, NULL,
                                !!format, format,
                                true, mode, &err);
+end:
     hmp_handle_error(mon, err);
 }