Fix AvbSlotVerifyData->cmdline might be NULL
When AVB_VBMETA_IMAGE_FLAGS_VERIFICATION_DISABLED is set, AvbSlotVerifyData->cmdline should be a NUL-terminated string instead of NULL. Bug: 119551429 Test: atest libavb_host_unittest Change-Id: I27616b217f01acf7e1196bacc023ea610117935c
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