[PATCH 1/1] tools: imx8m_image: fix warning message

[sbabic at denx.de]

> When a firmware file is missing the warning message doesn't indicate the
> firmware file name because '$tmp' var doesn't exist.
> Fix the warning message and while at it reduce the if/else statement.
> Signed-off-by: Sébastien Szymanski <sebastien.szymanski at armadeus.com>
> Reviewed-by: Frieder Schrempf <frieder.schrempf at kontron.de>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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