tpm2_getrandom: Fix --force parameter #1870

Job	Run time
coverage-test	6m 15s
master-tss-build-test (gcc)	17m 10s
build-test (ubuntu-20.04, gcc)	5m 53s
build-test (ubuntu-20.04, clang)	4m 56s
coverity-test	0s
master-tss-build-test (clang)	4m 56s
build-test (fedora-30, gcc)	5m 47s
build-test (fedora-30, clang)	6m 47s
build-test (opensuse-leap, gcc)	5m 56s
build-test (opensuse-leap, clang)	5m 11s
build-test (fedora-32, gcc)	5m 49s
build-test (fedora-32, clang)	5m 9s
build-test (ubuntu-22.04, gcc)	10m 42s
build-test (ubuntu-22.04, clang)	10m 5s
	1h 34m 36s

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