[PATCH] block: add SPDX header line to blk-throttle.h

[Bird, Tim]

Add an SPDX license identifier line to blk-throttle.h

Use 'GPL-2.0' as the identifier, since blk-throttle.c uses
that, and blk.h (from which some material was copied when
blk-throttle.h was created) also uses that identifier.

Signed-off-by: Tim Bird <tim.bird@xxxxxxxx>
---
 block/blk-throttle.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/block/blk-throttle.h b/block/blk-throttle.h
index 1a36d1278eea..3b88ef4a9a40 100644
--- a/block/blk-throttle.h
+++ b/block/blk-throttle.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef BLK_THROTTLE_H
 #define BLK_THROTTLE_H
 
-- 
2.43.0