migration/migration.c: Remove superfluous breaks

Remove superfluous breaks, as there is a "return" before them.
Signed-off-by: NLiao Pingfang <liao.pingfang@zte.com.cn>
Signed-off-by: NYi Wang <wang.yi59@zte.com.cn>
Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: NJuan Quintela <quintela@redhat.com>
Reviewed-by: NThomas Huth <thuth@redhat.com>
Signed-off-by: NJuan Quintela <quintela@redhat.com>

migration/migration.c

@@ -986,7 +986,6 @@ static void fill_source_migration_info(MigrationInfo *info)
         /* no migration has happened ever */
         /* do not overwrite destination migration status */
         return;
-        break;
     case MIGRATION_STATUS_SETUP:
         info->has_status = true;
         info->has_total_time = false;
@@ -1105,7 +1104,6 @@ static void fill_destination_migration_info(MigrationInfo *info)
     switch (mis->state) {
     case MIGRATION_STATUS_NONE:
         return;
-        break;
     case MIGRATION_STATUS_SETUP:
     case MIGRATION_STATUS_CANCELLING:
     case MIGRATION_STATUS_CANCELLED: