[PATCH] t4062: stop using repetition in regex

OpenBSD's regex library has a repetition limit (RE_DUP_MAX) of 255.
That's the minimum acceptable value according to POSIX.  In t4062 we use
4096 repetitions in the test "-G matches", though, causing it to fail.

Do the same as the test "-S --pickaxe-regex" in the same file and search
for a single zero instead.  That still suffices to trigger the buffer
overrun in older versions (checked with b7d36ffca02^ and --valgrind on
Linux), simplifies the test a bit, and avoids exceeding OpenBSD's limit.

Original-patch-by: David Coppa [off-list ref]
Signed-off-by: Rene Scharfe <redacted>
---
 t/t4062-diff-pickaxe.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/t/t4062-diff-pickaxe.sh b/t/t4062-diff-pickaxe.sh
index 7c4903f497..c16e5af6fa 100755
--- a/t/t4062-diff-pickaxe.sh
+++ b/t/t4062-diff-pickaxe.sh

@@ -15,7 +15,7 @@ test_expect_success setup '
 	git commit -m "A 4k file"
 '
 test_expect_success '-G matches' '
-	git diff --name-only -G "^0{4096}$" HEAD^ >out &&
+	git diff --name-only -G0 HEAD^ >out &&
 	test 4096-zeroes.txt = "$(cat out)"
 '
 

-- 
2.14.0