uio: add SPDX license tag

Replace short statement in comment with proper SPDX
license tag.

Signed-off-by: Stephen Hemminger <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 5d421d7..f63967c 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * drivers/uio/uio.c
  *
@@ -9,8 +10,6 @@
  * Userspace IO
  *
  * Base Functions
- *
- * Licensed under the GPLv2 only.
  */
 
 #include <linux/module.h>