strbuf: clear errno before calling getdelim(3)

getdelim(3) returns -1 at the end of the file and if it encounters an
error, but sets errno only in the latter case.  Set errno to zero before
calling it to avoid misdiagnosing an out-of-memory condition due to a
left-over value from some other function call.

Reported-by: Yaroslav Halchenko <yoh@onerussian.com>
Suggested-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/strbuf.c b/strbuf.c
index ace58e7367..977acba31b 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -472,6 +472,7 @@ int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
 	/* Translate slopbuf to NULL, as we cannot call realloc on it */
 	if (!sb->alloc)
 		sb->buf = NULL;
+	errno = 0;
 	r = getdelim(&sb->buf, &sb->alloc, term, fp);
 
 	if (r > 0) {