macro: ensure ret_errno() always returns negative

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

diff --git a/src/lxc/macro.h b/src/lxc/macro.h
index 4c13f8335933596ddb15336d6aeaa94671fc21c0..42f95c23541ef38d7778636e8d2852a260d6bfa2 100644 (file)
--- a/src/lxc/macro.h
+++ b/src/lxc/macro.h
@@ -663,10 +663,10 @@ enum {
                __internal_ret__;                             \
        })
 
-#define ret_errno(__errno__)         \
-       ({                           \
-               errno = (__errno__); \
-               -(__errno__);        \
+#define ret_errno(__errno__)             \
+       ({                               \
+               errno = labs(__errno__); \
+               -errno;                  \
        })
 
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