selftests/bpf: shorten subtest names for struct_ops_module test

Drive-by clean up, we shouldn't use meaningless "test_" prefix for
subtest names.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240507001335.1445325-8-andrii@kernel.org
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>

Author: anakryiko

tools/testing/selftests/bpf/prog_tests/test_struct_ops_module.c

@@ -244,13 +244,13 @@ static void test_struct_ops_forgotten_cb(void)
 
 void serial_test_struct_ops_module(void)
 {
-	if (test__start_subtest("test_struct_ops_load"))
+	if (test__start_subtest("struct_ops_load"))
 		test_struct_ops_load();
-	if (test__start_subtest("test_struct_ops_not_zeroed"))
+	if (test__start_subtest("struct_ops_not_zeroed"))
 		test_struct_ops_not_zeroed();
-	if (test__start_subtest("test_struct_ops_incompatible"))
+	if (test__start_subtest("struct_ops_incompatible"))
 		test_struct_ops_incompatible();
-	if (test__start_subtest("test_struct_ops_null_out_cb"))
+	if (test__start_subtest("struct_ops_null_out_cb"))
 		test_struct_ops_nulled_out_cb();
 	if (test__start_subtest("struct_ops_forgotten_cb"))
 		test_struct_ops_forgotten_cb();