[PATCH v3 25/34] mailinfo: handle_commit_msg() shouldn't be called after finding patchbreak

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There is a strange "if (!mi->cmitmsg) return 0" at the very beginning
of handle_commit_msg(), but the condition should never trigger, because:

 * The only place cmitmsg is set to NULL is after this function sees
   a patch break, closes the FILE * to write the commit log message
   and returns 1.  This function returns non-zero only from that
   codepath.

 * The caller of this function, upon seeing a non-zero return,
   increments filter_stage, starts treating the input as patch text
   and will never call handle_commit_msg() again.

Replace it with an assert(!mi->filter_stage) to ensure the above
observation will stay to be true.

Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
---
 builtin/mailinfo.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/builtin/mailinfo.c b/builtin/mailinfo.c
index ec65805..286eda0 100644
--- a/builtin/mailinfo.c
+++ b/builtin/mailinfo.c
@@ -725,8 +725,7 @@ static int is_scissors_line(const struct strbuf *line)
 
 static int handle_commit_msg(struct mailinfo *mi, struct strbuf *line)
 {
-	if (!mi->cmitmsg)
-		return 0;
+	assert(!mi->filter_stage);
 
 	if (mi->header_stage) {
 		if (!line->len || (line->len == 1 && line->buf[0] == '\n'))
-- 
2.6.2-383-g144b2e6

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