splay: fix signed/unsigned mismatch warning

Follow-up to 4dee50b.

Ref: https://github.com/curl/curl/pull/1693

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/splay.c b/lib/splay.c
index 24c6491c5..68ff9c5db 100644
--- a/lib/splay.c
+++ b/lib/splay.c
@@ -102,7 +102,7 @@ struct Curl_tree *Curl_splayinsert(struct curltime i,
                                    struct Curl_tree *node)
 {
   static const struct curltime KEY_NOTUSED = {
-    -1, -1
+    (time_t)-1, (unsigned int)-1
   }; /* will *NEVER* appear */
 
   if(node == NULL)
@@ -212,7 +212,7 @@ int Curl_splayremovebyaddr(struct Curl_tree *t,
                            struct Curl_tree **newroot)
 {
   static const struct curltime KEY_NOTUSED = {
-    -1, -1
+    (time_t)-1, (unsigned int)-1
   }; /* will *NEVER* appear */
   struct Curl_tree *x;