Fix encryption/decryption return type for GOST28147
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Description

Fix encryption/decryption return type for GOST28147

* cipher/gost.h (_gcry_gost_enc_one): Change return type to
'unsigned int'.
* cipher/gost28147.c (max): New macro.
(gost_encrypt_block, gost_decrypt_block): Return burn stack depth.
(_gcry_gost_enc_one): Return burn stack depth from gost_encrypt_block.

Return type for block cipher functions was lately changed from 'void' to
'unsigned int' to pass burn stack depth to cipher mode code. Patch fixes
gost28147 to return stack burn value.