patch 7.4.2106
Problem:    Clang warns about missing field in initializer.
Solution:   Define COMMA and use it.  (Kazunobu Kuriyama)
diff --git a/src/ex_cmds.c b/src/ex_cmds.c
index 7d8196c..2afa5e7 100644
--- a/src/ex_cmds.c
+++ b/src/ex_cmds.c
@@ -4008,6 +4008,7 @@
 	    }
 	    vim_free(new_name);
 	    au_new_curbuf.br_buf = NULL;
+	    au_new_curbuf.br_buf_free_count = 0;
 #endif
 	}
 
@@ -4389,6 +4390,7 @@
 	    name == NULL ? (char_u *)"" : name);
     vim_free(name);
     au_new_curbuf.br_buf = NULL;
+    au_new_curbuf.br_buf_free_count = 0;
 }
 #endif