compat-wireless: fix code-metrics for 1 patch

compat-wireless: fix code-metrics for 1 patch

If we only have one patch then the currently grep will
not parse correctly, force the grep to always include the
filename so that the existing computation can be used for
both the case we use only one patch file in the directories:

linux-next-pending/
linux-next-cherry-pick/
crap/

This fixes the computation for linux-next-pending/ right
now.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>