patch 9.0.0376: clang warns for dead assignments

Problem:    Clang warns for dead assignments.
Solution:   Adjust the code. (Yegappan Lakshmanan, closes #11048)
diff --git a/src/insexpand.c b/src/insexpand.c
index b91c230..f9ee4e6 100644
--- a/src/insexpand.c
+++ b/src/insexpand.c
@@ -3121,8 +3121,10 @@
 				      ? compl_curr_match->cp_number - 1 : -1);
     }
 
-    // TODO
-    // if (ret == OK && (what_flag & CI_WHAT_INSERTED))
+    if (ret == OK && (what_flag & CI_WHAT_INSERTED))
+    {
+	// TODO
+    }
 }
 
 /*