While size_t-fying let's not forget to update documentation:-)

doc/crypto/EVP_DigestInit.pod

@@ -18,7 +18,7 @@ EVP digest routines
  EVP_MD_CTX *EVP_MD_CTX_create(void);
 
  int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl);
- int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *d, unsigned int cnt);
+ int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *d, size_t cnt);
  int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md,
         unsigned int *s);