[PATCH] Check for large pack offsets could be optimized away

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Without this fix gcc 4.2.1 warns with:

warning: assuming signed overflow does not occur
when assuming that (X + c) < X is always false

Signed-off-by: Marco Costalba <mcostalba@xxxxxxxxx>
---
 sha1_file.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/sha1_file.c b/sha1_file.c
index b219d4d..ba29000 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -524,7 +524,8 @@ static int check_packed_git_idx
 		if (idx_size != min_size) {
 			/* make sure we can deal with large pack offsets */
 			off_t x = 0x7fffffffUL, y = 0xffffffffUL;
-			if (x > (x + 1) || y > (y + 1)) {
+			off_t x1 = x + 1, y1 = y + 1;
+			if (x > x1 || y > y1) {
  				munmap(idx_map, idx_size);
 				return error("pack too large for current definition of off_t in %s", path);
 			}
-- 
1.5.3.rc4.67.gf9286
-
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