Fix symbol mismatch between public header and interface (plist_bool_val_is_true)
diff --git a/src/plist.c b/src/plist.c
index 2d5042e..0fb1017 100644
--- a/src/plist.c
+++ b/src/plist.c
@@ -1186,7 +1186,7 @@
     plist_set_element_val(node, PLIST_DATE, &val, sizeof(struct timeval));
 }
 
-PLIST_API int plist_boolean_is_true(plist_t boolnode)
+PLIST_API int plist_bool_val_is_true(plist_t boolnode)
 {
     if (!PLIST_IS_BOOLEAN(boolnode)) {
         return -1;