linux_dmabuf allow userland access

Author: yanko-yankulov

sys/compat/linuxkpi/common/src/linux_dmabuf.c

@@ -374,7 +374,7 @@ dma_buf_export(const struct dma_buf_export_info *exp_info)
 	if ((err = falloc_noinstall(curthread, &fp)))
 		goto err;
 
-	finit(fp, 0, DTYPE_DMABUF, db, &dma_buf_fileops);
+	finit(fp, (FREAD | FWRITE), DTYPE_DMABUF, db, &dma_buf_fileops);
 
 	db->linux_file = fp;
 	mutex_init(&db->lock);