nvm_flash_log: fix object limit in addObject

Author: rizlik

src/wh_nvm_flash_log.c

@@ -613,9 +613,6 @@ int wh_NvmFlashLog_AddObject(void* c, whNvmMetadata* meta, whNvmSize data_len,
         return WH_ERROR_BADARGS;
 
     count = nfl_ObjectCount(ctx, NULL);
-    if (count >= WOLFHSM_CFG_NVM_OBJECT_COUNT)
-        return WH_ERROR_NOSPACE;
-
     available_space = ctx->partition_size -
                       sizeof(whNvmFlashLogPartitionHeader) -
                       ctx->directory.header.size;
@@ -624,11 +621,15 @@ int wh_NvmFlashLog_AddObject(void* c, whNvmMetadata* meta, whNvmSize data_len,
     if (old_obj != NULL) {
         available_space +=
             sizeof(whNvmFlashLogMetadata) + PAD_SIZE(old_obj->meta.len);
+        count -= 1;
     }
 
     if (PAD_SIZE(data_len) + sizeof(whNvmFlashLogMetadata) > available_space)
         return WH_ERROR_NOSPACE;
 
+    if (count >= WOLFHSM_CFG_NVM_OBJECT_COUNT)
+        return WH_ERROR_NOSPACE;
+
     if (old_obj) {
         ret = nfl_ObjectDestroy(ctx, meta->id);
         if (ret != WH_ERROR_OK)