Update Error message in getVerifiedCosState
Update Error message in getVerifiedCosState

"found more than one" is more accurate as the events don't actually have
to be duplicates to cause an issue.

Signed-off-by: Joe Richey <24d3dd8348b5cac19a417e52b4f8141ba91506f0@google.com>

google/go-tpm-tools,google/go-tpm-tools,google/go-tpm-tools