qemu-file: No need to check for shutdown in qemu_file_rate_limit

After calling qemu_file_shutdown() we set the error as -EIO if there
is no another previous error, so no need to check it here.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20230504113841.23130-6-quintela@redhat.com>

migration/qemu-file.c

@@ -732,9 +732,6 @@ int64_t qemu_file_total_transferred(QEMUFile *f)
 
 int qemu_file_rate_limit(QEMUFile *f)
 {
-    if (f->shutdown) {
-        return 1;
-    }
     if (qemu_file_get_error(f)) {
         return 1;
     }