tree-wide: improve logging

src/lxc/attach.c

@@ -325,7 +325,7 @@ static int lxc_attach_set_environment(struct lxc_proc_context_info *init_ctx,
 
 	ret = putenv("container=lxc");
 	if (ret < 0)
-		return log_warn(-1, errno, "Failed to set environment variable");
+		return log_warn(-1, "Failed to set environment variable");
 
 	/* Set container environment variables.*/
 	if (init_ctx && init_ctx->container && init_ctx->container->lxc_conf) {

src/lxc/log.h

@@ -510,10 +510,10 @@ __lxc_unused static inline void LXC_##LEVEL(struct lxc_log_locinfo* locinfo,	\
 		__ret__;				\
 	})
 
-#define log_warn(__ret__, __errno__, format, ...) \
-	({                                        \
-		WARN(format, ##__VA_ARGS__);      \
-		__ret__;                          \
+#define log_warn(__ret__, format, ...)       \
+	({                                   \
+		WARN(format, ##__VA_ARGS__); \
+		__ret__;                     \
 	})
 
 #define log_debug_errno(__ret__, __errno__, format, ...) \