[PATCH] hex: use unsigned index for ring buffer

["René Scharfe" <l.s.r@web.de>]

Overflow is defined for unsigned integers, but not for signed ones.
Make the ring buffer index in sha1_to_hex() unsigned to be on the
safe side.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
---
Hard to trigger, but probably even harder to diagnose once someone
somehow manages to do it on some uncommon architecture.

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

diff --git a/hex.c b/hex.c
index ab2610e..8c6c189 100644
--- a/hex.c
+++ b/hex.c
@@ -76,7 +76,7 @@ char *oid_to_hex_r(char *buffer, const struct object_id *oid)
 
 char *sha1_to_hex(const unsigned char *sha1)
 {
-	static int bufno;
+	static unsigned int bufno;
 	static char hexbuffer[4][GIT_SHA1_HEXSZ + 1];
 	return sha1_to_hex_r(hexbuffer[3 & ++bufno], sha1);
 }
-- 
2.10.1