lib: fix avl tree lookup

The delta between IDs can be bigger than INT_MAX, causing order mismatch
in the tree and lookup failures

Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/lib.c b/lib.c
index ec8c23d64da814b2dfca13dd34ca4ebdde0d39ee..caba7d9a1f9f25ab0c7b36a45c3e8539fe02b4f0 100644 (file)
--- a/lib.c
+++ b/lib.c
@@ -37,7 +37,11 @@ static void __randname(char *template)
 int udebug_id_cmp(const void *k1, const void *k2, void *ptr)
 {
        uint32_t id1 = (uint32_t)(uintptr_t)k1, id2 = (uint32_t)(uintptr_t)k2;
-       return id1 - id2;
+       if (id1 < id2)
+               return -1;
+       else if (id1 > id2)
+               return 1;
+       return 0;
 }
 
 static inline int