xbc_calc_checksum() only reads the data buffer, so mark the parameter
as const void * and the internal pointer as const unsigned char *.

Signed-off-by: Josh Law <objecting@objecting.org>
---
 include/linux/bootconfig.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/bootconfig.h b/include/linux/bootconfig.h
index 25df9260d206..23a96c5edcf3 100644
--- a/include/linux/bootconfig.h
+++ b/include/linux/bootconfig.h
@@ -36,9 +36,9 @@ bool __init cmdline_has_extra_options(void);
  * The checksum will be used with the BOOTCONFIG_MAGIC and the size for
  * embedding the bootconfig in the initrd image.
  */
-static inline __init uint32_t xbc_calc_checksum(void *data, uint32_t size)
+static inline __init uint32_t xbc_calc_checksum(const void *data, uint32_t size)
 {
-	unsigned char *p = data;
+	const unsigned char *p = data;
 	uint32_t ret = 0;
 
 	while (size--)
-- 
2.34.1