*.[ch] refactoring: make use of the FREE_AND_NULL() macro

Replace occurrences of `free(ptr); ptr = NULL` which weren't caught by
the coccinelle rule. These fall into two categories:

 - free/NULL assignments one after the other which coccinelle all put
   on one line, which is functionally equivalent code, but very ugly.

 - manually spotted occurrences where the NULL assignment isn't right
   after the free() call.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/rerere.c b/rerere.c
index c26c29f87a..61f3804a1e 100644
--- a/rerere.c
+++ b/rerere.c
@@ -39,9 +39,8 @@ static void free_rerere_dirs(void)
 		free(rerere_dir[i]->status);
 		free(rerere_dir[i]);
 	}
-	free(rerere_dir);
+	FREE_AND_NULL(rerere_dir);
 	rerere_dir_nr = rerere_dir_alloc = 0;
-	rerere_dir = NULL;
 }
 
 static void free_rerere_id(struct string_list_item *item)