tpm2_send: Fix EOF detection on input file #1684

Job	Run time
master-tss-build-test (gcc)	17m 54s
master-tss-build-test (clang)	5m 10s
coverage-test	5m 51s
coverity-test	0s
build-test (ubuntu-18.04, gcc)	5m 42s
build-test (ubuntu-18.04, clang)	5m 3s
build-test (ubuntu-20.04, gcc)	5m 49s
build-test (ubuntu-20.04, clang)	5m 3s
build-test (fedora-30, gcc)	5m 56s
build-test (fedora-30, clang)	5m 23s
build-test (opensuse-leap, gcc)	6m 3s
build-test (opensuse-leap, clang)	5m 9s
build-test (fedora-32, gcc)	5m 55s
build-test (fedora-32, clang)	5m 4s
build-test (ubuntu-22.04, gcc)	11m 18s
build-test (ubuntu-22.04, clang)	10m 42s
	1h 46m 2s

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