[Patch contrib] check_GNU_style: remove tmp file

[Christophe Lyon]

Hi,

check_GNU_style.sh currently leaves a temporary file in the current directory.
This patch removes it upon exit.

Christophe.

2012-09-03   Christophe Lyon  <christophe.lyon@linaro.org>

	* check_GNU_style.sh: Remove temporay file upon exit.
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