Make 'prepare_temp_file()' ignore st_size for symlinks

The code was already set up to not really need it, so this just massages
it a bit to remove the use entirely.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 4 insertions, 5 deletions

diff --git a/diff.c b/diff.c
index 4b2029caa..f160c1a35 100644
--- a/diff.c
+++ b/diff.c
@@ -1881,13 +1881,12 @@ static void prepare_temp_file(const char *name,
 		if (S_ISLNK(st.st_mode)) {
 			int ret;
 			char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
-			size_t sz = xsize_t(st.st_size);
-			if (sizeof(buf) <= st.st_size)
-				die("symlink too long: %s", name);
-			ret = readlink(name, buf, sz);
+			ret = readlink(name, buf, sizeof(buf));
 			if (ret < 0)
 				die("readlink(%s)", name);
-			prep_temp_blob(temp, buf, sz,
+			if (ret == sizeof(buf))
+				die("symlink too long: %s", name);
+			prep_temp_blob(temp, buf, ret,
 				       (one->sha1_valid ?
 					one->sha1 : null_sha1),
 				       (one->sha1_valid ?