test-lib: turn off "-x" tracing during chain-lint check

Now that GIT_TEST_CHAIN_LINT is on by default, running: ./t0000-basic.sh -x --verbose-only=1 starts with: expecting success: find .git/objects -type f -print >should-be-empty && test_line_count = 0 should-be-empty + exit 117 error: last command exited with $?=117 + find .git/objects -type f -print + test_line_count = 0 should-be-empty + test 3 != 3 + wc -l + test 0 = 0 ok 1 - .git/objects should be empty after git init in an empty repo This is confusing, as the "exit 117" line and the error line (which is printed in red, no less!) are not part of the test at all, but are rather in the separate chain-lint test_eval. Let's unset the "trace" variable when eval-ing the chain lint check, which avoids this. Note that we cannot just do a one-shot variable like: trace= test_eval ... as the behavior of one-shot variables for function calls is not portable. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>