Fix memory leak in call() retptr allocation (#295) #943

Job	Run time
lint	45s
build-splicer (ubuntu-latest)	1m 57s
build-splicer (windows-latest)	4m 16s
build (debug)	11m 38s
build (release)	11m 28s
test-example	3m 50s
test (23.10.0, macos-latest, debug)	7m 17s
test (23.10.0, ubuntu-latest, debug)	7m 0s
test (23.10.0, windows-latest, release)	8m 28s
test (23.10.0, macos-latest, release)	4m 49s
test (23.10.0, windows-latest, debug)	10m 2s
test (23.10.0, ubuntu-latest, release)	6m 29s
	1h 17m 59s

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