[PATCH 1/2] read_and_strip_branch: fix typo'd address-of operator

[Jeff King <peff@peff.net>]

When we are chomping newlines from the end of a strbuf, we
must check "sb.len != 0" before accessing "sb.buf[sb.len - 1]".
However, this code mistakenly checks "&sb.len", which is
always true (it is a part of an auto struct, so the address
is always non-zero). This could lead to us accessing memory
outside the strbuf when we read an empty file.

Signed-off-by: Jeff King <peff@peff.net>
---
This dates back to 8b87cfd (wt-status: move strbuf into
read_and_strip_branch(), 2013-03-16), so it is not a bug that needs
addressed during the -rc period.

This is the most minimal fix, but I kind of wonder if it should just be
using strbuf_rtrim (or even strbuf_trim) in the first place.

 wt-status.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wt-status.c b/wt-status.c
index b54eac5..29666d0 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -1140,7 +1140,7 @@ static char *read_and_strip_branch(const char *path)
 	if (strbuf_read_file(&sb, git_path("%s", path), 0) <= 0)
 		goto got_nothing;
 
-	while (&sb.len && sb.buf[sb.len - 1] == '\n')
+	while (sb.len && sb.buf[sb.len - 1] == '\n')
 		strbuf_setlen(&sb, sb.len - 1);
 	if (!sb.len)
 		goto got_nothing;
-- 
2.3.0.rc1.287.g761fd19