[sw/silicon_creator] Minor cleanups in sig_verify

Signed-off-by: Alphan Ulusoy <alphan@google.com>
diff --git a/sw/device/silicon_creator/mask_rom/sig_verify.c b/sw/device/silicon_creator/mask_rom/sig_verify.c
index c96f9e5..f1c138e 100644
--- a/sw/device/silicon_creator/mask_rom/sig_verify.c
+++ b/sw/device/silicon_creator/mask_rom/sig_verify.c
@@ -90,7 +90,7 @@
 }
 
 rom_error_t sigverify_rom_ext_signature_verify(
-    const uint8_t *signed_region, size_t signed_region_len,
+    const void *signed_region, size_t signed_region_len,
     const sigverify_rsa_buffer_t *signature, uint32_t key_id) {
   hmac_digest_t act_digest;
   hmac_sha256_init();
diff --git a/sw/device/silicon_creator/mask_rom/sig_verify.h b/sw/device/silicon_creator/mask_rom/sig_verify.h
index 52f9fd9..96cc12a 100644
--- a/sw/device/silicon_creator/mask_rom/sig_verify.h
+++ b/sw/device/silicon_creator/mask_rom/sig_verify.h
@@ -26,7 +26,7 @@
  * @return Result of the operation.
  */
 rom_error_t sigverify_rom_ext_signature_verify(
-    const uint8_t *signed_region, size_t signed_region_len,
+    const void *signed_region, size_t signed_region_len,
     const sigverify_rsa_buffer_t *signature, uint32_t key_id);
 
 #ifdef __cplusplus
diff --git a/sw/device/silicon_creator/mask_rom/sig_verify_unittest.cc b/sw/device/silicon_creator/mask_rom/sig_verify_unittest.cc
index 4cb3b96..204d91c 100644
--- a/sw/device/silicon_creator/mask_rom/sig_verify_unittest.cc
+++ b/sw/device/silicon_creator/mask_rom/sig_verify_unittest.cc
@@ -18,7 +18,6 @@
 namespace {
 using ::testing::DoAll;
 using ::testing::NotNull;
-using ::testing::Pointee;
 using ::testing::Return;
 using ::testing::SetArgPointee;