Add default values for critnib_find local vars

Author: kswiecicki

src/critnib/critnib.c

@@ -715,8 +715,8 @@ int critnib_find(struct critnib *c, uintptr_t key, enum find_dir_t dir,
                  uintptr_t *rkey, void **rvalue) {
     uint64_t wrs1, wrs2;
     struct critnib_leaf *k;
-    uintptr_t _rkey;
-    void **_rvalue;
+    uintptr_t _rkey = (uintptr_t)0x0;
+    void **_rvalue = NULL;
 
     /* <42 ≡ ≤41 */
     if (dir < -1) {