fwTPM: merge redundant FwDecryptSeed RSA output-bound guard #129

Job	Run time
smoke (swtpm-default, --enable-swtpm --disable-fwtpm, true)	1m 22s
smoke (fwtpm-default, --enable-fwtpm --enable-swtpm --enable-debug, false)	1m 33s
Empty Brace Scope Scan	6s
	3m 1s

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