Fix bugs found during code audit across api, adminapi, functional, examples - #1711

Fix bugs found during code audit across api, adminapi, functional, examples#1711

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balamurugana:Fix-bugs-found-during-code-audit-across-api-adminapi-functional-examplesbalamurugana/minio-java:Fix-bugs-found-during-code-audit-across-api-adminapi-functional-examplesCopy head branch name to clipboard