lib: fix exists() error return value

The current implementation incorrectly returned `false` which got treated
as `NULL` instead of a boolean `false` value.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/lib.c b/lib.c
index ced0808..9d7b26a 100644
--- a/lib.c
+++ b/lib.c
@@ -445,7 +445,7 @@ uc_exists(uc_vm_t *vm, size_t nargs)
 	char *k;
 
 	if (ucv_type(obj) != UC_OBJECT)
-		return false;
+		return ucv_boolean_new(false);
 
 	k = uc_cast_string(vm, &key, &freeable);