[Tarantool-patches] [PATCH luajit] test: fix libfficcall compilation for old GCC

[Sergey Kaplun]

On CentOS 7 GCC has no std=c99 by default. This leads to compilation
warnings and errors for ‘for’ loop initial declarations. This patch
fixes that by declaring the variable out of the loop body.
---

Branch: https://github.com/tarantool/luajit/tree/skaplun/gh-noticket-fix-tests-old-gcc
CI failure: https://github.com/tarantool/luajit/actions/runs/27124968515/job/80063067169#step:6:10593

 test/tarantool-tests/ffi-ccall/libfficcall.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/test/tarantool-tests/ffi-ccall/libfficcall.c b/test/tarantool-tests/ffi-ccall/libfficcall.c
index 2145b556..129bc75d 100644
--- a/test/tarantool-tests/ffi-ccall/libfficcall.c
+++ b/test/tarantool-tests/ffi-ccall/libfficcall.c
@@ -307,7 +307,8 @@ int test_2_large_agg_a16(int x, large_agg_a16 s1, large_agg_a16 s2)
 	const int *v1 = s1.v;
 	const int *v2 = s2.v;
 	int sum = x;
-	for (int i = 0; i < lengthof(s1.v); i++) {
+	int i = 0;
+	for (; i < lengthof(s1.v); i++) {
 		sum += v1[i] + v2[i];
 	}
 	return sum;
-- 
2.54.0