[PATCH 1/2] builtin-mailinfo.c: check error status from rewind and ftruncate

[Junio C Hamano <gitster@pobox.com>]

A recent "cut at scissors" implementation rewinds and truncates the output
file to store the message when it sees a scissors mark, but it did not
check if these library calls succeeded.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin-mailinfo.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/builtin-mailinfo.c b/builtin-mailinfo.c
index d498b1c..3306d9e 100644
--- a/builtin-mailinfo.c
+++ b/builtin-mailinfo.c
@@ -785,8 +785,10 @@ static int handle_commit_msg(struct strbuf *line)
 
 	if (use_scissors && is_scissors_line(line)) {
 		int i;
-		rewind(cmitmsg);
-		ftruncate(fileno(cmitmsg), 0);
+		if (rewind(cmitmsg))
+			die_errno("Could not rewind output message file");
+		if (ftruncate(fileno(cmitmsg), 0))
+			die_errno("Could not truncate output message file at scissors");
 		still_looking = 1;
 
 		/*
-- 
1.6.3