index: Set variable to NULL after free.

Then NULL check for this variable is not valid.
This fixes coverity CID 1193250:  Use after free  (USE_AFTER_FREE).

@fix

1 files changed, 1 insertions, 0 deletions

diff --git a/src/lib/elm_index.c b/src/lib/elm_index.c
index b3defd60e..460cf16ea 100644
--- a/src/lib/elm_index.c
+++ b/src/lib/elm_index.c
@@ -658,6 +658,7 @@ _sel_eval(Evas_Object *obj,
                          }
                     }
                   free(last);
+                  last = NULL;
                   if (it->letter) last = strdup(it->letter);
                }
           }