cryptnet: Constify a variable

[Andrew Talbot]

Changelog:
    cryptnet: Constify a variable.

diff --git a/dlls/cryptnet/cryptnet_main.c b/dlls/cryptnet/cryptnet_main.c
index 0b4e31d..e8e7adf 100644
--- a/dlls/cryptnet/cryptnet_main.c
+++ b/dlls/cryptnet/cryptnet_main.c
@@ -1582,7 +1582,7 @@ static DWORD verify_cert_revocation_with_crl(PCCERT_CONTEXT cert,
 
 static DWORD verify_cert_revocation_from_dist_points_ext(
  const CRYPT_DATA_BLOB *value, PCCERT_CONTEXT cert, DWORD index,
- FILETIME *pTime, DWORD dwFlags, PCERT_REVOCATION_PARA pRevPara,
+ FILETIME *pTime, DWORD dwFlags, const CERT_REVOCATION_PARA *pRevPara,
  PCERT_REVOCATION_STATUS pRevStatus)
 {
     DWORD error = ERROR_SUCCESS, cbUrlArray;