Fix the build warning under OPENSSL_NO_GOST

Variable 'pktype' was set but not used under OPENSSL_NO_GOST. This change
will fix the build warning under [-Werror=unused-but-set-variable].

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from #2961)

ssl/statem/statem_lib.c

@@ -281,7 +281,7 @@ MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt)
     unsigned char *gost_data = NULL;
 #endif
     int al = SSL_AD_INTERNAL_ERROR, ret = MSG_PROCESS_ERROR;
-    int type = 0, j, pktype;
+    int type = 0, j;
     unsigned int len;
     X509 *peer;
     const EVP_MD *md = NULL;
@@ -303,7 +303,6 @@ MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt)
         goto f_err;
     }
 
-    pktype = EVP_PKEY_id(pkey);
     type = X509_certificate_type(peer, pkey);
 
     if (!(type & EVP_PKT_SIGN)) {
@@ -384,6 +383,7 @@ MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt)
     }
 #ifndef OPENSSL_NO_GOST
     {
+        int pktype = EVP_PKEY_id(pkey);
         if (pktype == NID_id_GostR3410_2001
             || pktype == NID_id_GostR3410_2012_256
             || pktype == NID_id_GostR3410_2012_512) {