Return NULL from plist_copy() if passed a NULL pointer

This will prevent an assert if a NULL pointer is passed, and can make
writing some code easier and cleaner without the need for a NULL check.
For example, plist_copy(plist_dict_get_item(dict, "abc")) would give us
a copy of the dict's node if the dict has a value for the given key, or
NULL without any further checks.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/plist.c b/src/plist.c
index 0fb1017..38212d8 100644
--- a/src/plist.c
+++ b/src/plist.c
@@ -445,7 +445,7 @@ static plist_t plist_copy_node(node_t *node)
 
 PLIST_API plist_t plist_copy(plist_t node)
 {
-    return plist_copy_node(node);
+    return node ? plist_copy_node(node) : NULL;
 }
 
 PLIST_API uint32_t plist_array_get_size(plist_t node)