sha1_file: use the correct type (ssize_t, not size_t) for read-style function

Using an unsigned type, we would fail to detect a read error and then
proceed to try to write (size_t)-1 bytes.

Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/sha1_file.c b/sha1_file.c
index 5fc877fe4c579f97e3f5f6e6cebf5742e8a46a32..8a85217996a80af300f544fa9a3d8d905b50f266 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -2733,7 +2733,7 @@ static int index_stream(unsigned char *sha1, int fd, size_t size,
        while (size) {
                char buf[10240];
                size_t sz = size < sizeof(buf) ? size : sizeof(buf);
-               size_t actual;
+               ssize_t actual;
 
                actual = read_in_full(fd, buf, sz);
                if (actual < 0)