rng-random: Use qemu_open / qemu_close

In the rng backend use qemu_open and qemu_close rather than POSIX
open/close.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

backends/rng-random.c

@@ -74,7 +74,7 @@ static void rng_random_opened(RngBackend *b, Error **errp)
         error_set(errp, QERR_INVALID_PARAMETER_VALUE,
                   "filename", "a valid filename");
     } else {
-        s->fd = open(s->filename, O_RDONLY | O_NONBLOCK);
+        s->fd = qemu_open(s->filename, O_RDONLY | O_NONBLOCK);
 
         if (s->fd == -1) {
             error_set(errp, QERR_OPEN_FILE_FAILED, s->filename);
@@ -130,7 +130,7 @@ static void rng_random_finalize(Object *obj)
     qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
 
     if (s->fd != -1) {
-        close(s->fd);
+        qemu_close(s->fd);
     }
 
     g_free(s->filename);