Revert "mbedtls: Change the last argument of cipher_[de|en]crypt_cbc to size_t"

because of inconsistent author and sign-off

This reverts commit aef467ab4a.

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

src/libmbedcrypto.c

@@ -693,7 +693,7 @@ static void cipher_encrypt(struct ssh_cipher_struct *cipher,
 }
 
 static void cipher_encrypt_cbc(struct ssh_cipher_struct *cipher, void *in, void *out,
-        size_t len)
+        unsigned long len)
 {
     size_t outlen = 0;
     int rc = 0;
@@ -751,7 +751,7 @@ static void cipher_decrypt(struct ssh_cipher_struct *cipher,
 }
 
 static void cipher_decrypt_cbc(struct ssh_cipher_struct *cipher, void *in, void *out,
-        size_t len)
+        unsigned long len)
 {
     size_t outlen = 0;
     int rc = 0;