Vboot Reference: Make length types explicitly sized.

src/platform/vboot_reference/tests/sha_benchmark.c

Index: src/platform/vboot_reference/tests/sha_benchmark.c
diff --git a/src/platform/vboot_reference/tests/sha_benchmark.c b/src/platform/vboot_reference/tests/sha_benchmark.c
index 498e25b8e098ffa11376eb2b91badc0889c32445..b36695b527f43d40b73d3ad1e6145718603e2ada 100644
--- a/src/platform/vboot_reference/tests/sha_benchmark.c
+++ b/src/platform/vboot_reference/tests/sha_benchmark.c
@@ -14,7 +14,7 @@
 #define TEST_BUFFER_SIZE 4000000
 
 /* Table of hash function pointers and their description. */
-typedef uint8_t* (*Hashptr) (const uint8_t*, int, uint8_t*);
+typedef uint8_t* (*Hashptr) (const uint8_t*, uint64_t, uint8_t*);
 typedef struct HashFxTable {
   Hashptr hash;
   char* description;