Fix crash and latest update.

crypto/sm2/sm2_pmeth.c

@@ -220,6 +220,10 @@ static int pkey_sm2_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
         *(size_t *)p2 = smctx->id_len;
         return 1;
 
+    case EVP_PKEY_CTRL_DIGESTINIT:
+        /* nothing to be inited, this is to suppress the error... */
+        return 1;
+
     default:
         return -2;
     }