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	scripts/kernel_bump: Improve omitted version error
If a version string was not supplied, we currently print an empty string. We can do better here. Also by popular demand, print the usage information in case of error. Signed-off-by: Olliver Schinagl <oliver@schinagl.nl>
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				@ -205,7 +205,9 @@ main()
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	target_version="${target_version:-${TARGET_VERSION:-}}"
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	if [ -z "${source_version:-}" ] || [ -z "${target_version:-}" ]; then
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		e_err "Source (${source_version}) and target (${target_version}) versions need to be defined."
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		e_err "Source (${source_version:-missing source version}) and target (${target_version:-missing target version}) versions need to be defined."
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		echo
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		usage
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		exit 1
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	fi
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