[PATCH build 5/6] Report usage errors.

[Gaetan Nadon]

On Wed, 2010-09-08 at 10:36 -0400, Trevor Woerner wrote:

> If the build script is invoked incorrectly, return non-zero
> to indicate the usage error.
> 
> Signed-off-by: Trevor Woerner <twoerner at gmail.com>
> 

The commit message should state what is considered incorrect.

The patch needs to be rebased. (git apply --check fails)

Reviewed-by: Gaetan Nadon <memsize at videotron.ca>

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