kunit: tool: fix --json output for skipped tests

Currently, KUnit will report SKIPPED tests as having failed if one uses
--json.

Add the missing if statement to set the appropriate status ("SKIP").
See https://api.kernelci.org/schema-test-case.html:
"status": {
"type": "string",
"description": "The status of the execution of this test case",
"enum": ["PASS", "FAIL", "SKIP", "ERROR"],
"default": "PASS"
},
with this, we now can properly produce all four of the statuses.

Fixes: 5acaf6031f53 ("kunit: tool: Support skipped tests in kunit_tool")
Signed-off-by: Daniel Latypov <[e-mail]>
Reviewed-by: David Gow <[e-mail]>
Reviewed-by: Brendan Higgins <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/kunit/kunit_json.py

···
 			test_case = {"name": subtest.name, "status": "FAIL"}
 			if subtest.status == TestStatus.SUCCESS:
 				test_case["status"] = "PASS"
+			elif subtest.status == TestStatus.SKIPPED:
+				test_case["status"] = "SKIP"
 			elif subtest.status == TestStatus.TEST_CRASHED:
 				test_case["status"] = "ERROR"
 			test_cases.append(test_case)

tools/testing/kunit/kunit_tool_test.py

···
 			{'name': 'example_simple_test', 'status': 'ERROR'},
 			result["sub_groups"][1]["test_cases"][0])
 
+	def test_skipped_test_json(self):
+		result = self._json_for('test_skip_tests.log')
+		self.assertEqual(
+			{'name': 'example_skip_test', 'status': 'SKIP'},
+			result["sub_groups"][1]["test_cases"][1])
+
 	def test_no_tests_json(self):
 		result = self._json_for('test_is_test_passed-no_tests_run_with_header.log')
 		self.assertEqual(0, len(result['sub_groups']))