xpath BUGFIX in eval_predicate

Uninitialized local variable.
diff --git a/src/xpath.c b/src/xpath.c
index 4d48a17..7f5a0d3 100644
--- a/src/xpath.c
+++ b/src/xpath.c
@@ -6781,7 +6781,7 @@
     uint16_t orig_exp;
     uint32_t i, orig_pos, orig_size;
     int32_t pred_in_ctx;
-    struct lyxp_set set2;
+    struct lyxp_set set2 = {0};
     struct lyd_node *orig_parent;
 
     /* '[' */