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-rw-r--r--lib/ctype.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/ctype.c b/lib/ctype.c
index c646df91a2f7..c819fe269eb2 100644
--- a/lib/ctype.c
+++ b/lib/ctype.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* linux/lib/ctype.c
*