p0004: simplify calls of test-lazy-init-name-hash

The test library puts helpers into $PATH, so we can simply call them
without specifying their location.

The suffix $X is also not necessary because .exe files on Windows can be
started without specifying their extension, and on other platforms it's
empty anyway.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Acked-by: Jeff Hostetler <git@jeffhostetler.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: rscharfe

t/perf/p0004-lazy-init-name-hash.sh

@@ -7,13 +7,13 @@ test_perf_large_repo
 test_checkout_worktree
 
 test_expect_success 'verify both methods build the same hashmaps' '
-	$GIT_BUILD_DIR/t/helper/test-lazy-init-name-hash$X --dump --single | sort >out.single &&
-	$GIT_BUILD_DIR/t/helper/test-lazy-init-name-hash$X --dump --multi  | sort >out.multi  &&
+	test-lazy-init-name-hash --dump --single | sort >out.single &&
+	test-lazy-init-name-hash --dump --multi  | sort >out.multi  &&
 	test_cmp out.single out.multi
 '
 
 test_expect_success 'multithreaded should be faster' '
-	$GIT_BUILD_DIR/t/helper/test-lazy-init-name-hash$X --perf >out.perf
+	test-lazy-init-name-hash --perf >out.perf
 '
 
 test_done