pre-upload.py: iterate over each commit

BUG=none
TEST=Tested on a kernel branch with two commits.

Change-Id: I2aa5db8f6bc41f6fb2237a969048634c0d2f74cc
1 file changed
tree: 1fb00923c0ebb6a60e7d1260907ce32f9f0d3033
  1. checkpatch.pl
  2. pre-upload.py