Ensure that Fixer::endChangeset() returns the real outcome #1287

Job	Run time
Build Phar on PHP: 8.0	26s
Coverage: 5.4	16m 43s
Coverage: 7.2 with custom ini settings	3m 52s
Coverage: 8.3	2m 50s
PHP: 5.4	1m 0s
PHP: 5.5	4m 18s
PHP: 5.6	3m 32s
PHP: 7.0	1m 0s
PHP: 7.1	59s
PHP: 7.2	57s
PHP: 7.3	43s
PHP: 7.4	41s
PHP: 8.0	49s
PHP: 8.1	48s
PHP: 8.2	48s
PHP: 8.3	40s
PHP: 8.4	41s
PHP: 5.5 with custom ini settings	3m 29s
PHP: 7.0 with custom ini settings	40s
coveralls-finish	5s
	45m 1s

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