Warn about missing header files, rather than silently ignoring.

Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/all/aYoCiXg8pSC_bwIv@willie-the-truck/
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 util/update_headers.sh | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/util/update_headers.sh b/util/update_headers.sh
index 7902dddb..2f981ca3 100755
--- a/util/update_headers.sh
+++ b/util/update_headers.sh
@@ -40,11 +40,14 @@ done
 unset KVMTOOL_PATH
 
 copy_uapi_asm_header () {
-	local src="$LINUX_ROOT/arch/$arch/include/uapi/asm/$1"
+	local file="arch/$arch/include/uapi/asm/$1"
+	local src="$LINUX_ROOT/$file"
 
 	if [ -r "$src" ]
 	then
 		cp -- "$src" "$KVMTOOL_PATH/include/asm/"
+	else
+		echo "Warning: Unable to find $file, skipping..."
 	fi
 }
 
-- 
2.43.0