checkpatch: Fix the commit log false positive warnings

Checkpatch is throwing a warning for lines that contains file delta
in the commit log.

WARNING: Possible unwrapped commit description
(prefer a maximum 75 chars per line)
kerneldir/msm-abc-xyz123.dtsi
              | 68 ++++++++++++++++++++++++++++++++++++++++----

This file delta line of the patch should be ignored for maximum characters
per line check and is taken care of already, but it's not covering if the
file has '-' in its name. Update the conditional check to cover this case.

Change-Id: If37691aa897f8a991c1643a08fbde45cc4afaaf7
Signed-off-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>