patch 9.1.0194: gcc complains about uninitialized var

Problem:  gcc complains about uninitialized var
          (Tony Mechelynck)
Solution: initialize to NULL

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/insexpand.c b/src/insexpand.c
index c080d60..9b5e5de 100644
--- a/src/insexpand.c
+++ b/src/insexpand.c
@@ -3095,7 +3095,7 @@
 
     if (ret == OK && (what_flag & CI_WHAT_ITEMS || what_flag & CI_WHAT_SELECTED))
     {
-	list_T	    *li;
+	list_T	    *li = NULL;
 	dict_T	    *di;
 	compl_T     *match;
 	int         selected_idx = -1;