fix(checkpatch): detect issues in commit message

The current implementation of make checkpatch does not detect issues
when Signed-off-by line is missing. The solution is to concatenate
the output of both git log and git diff before executing checkpatch
script.

Change-Id: Ic2d6f8bc10316d73b72a73a1807aa36cdec6900d
Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
1 file changed