Move warning message for mod_image_for_test before actual library call.

Users of other calling scripts that no-op in this scripts are seeing
the warning message incorrectly. Moving this message further down
avoids this issue.

BUG=None
TEST=Visual. Also using to test unified commit queue.

Change-Id: I7bc227f37b26bcedbdb8214286a3f8646ddb610c
Reviewed-on: https://gerrit.chromium.org/gerrit/24369
Reviewed-by: Chris Sosa <sosa@chromium.org>
Tested-by: Chris Sosa <sosa@chromium.org>
Commit-Ready: Chris Sosa <sosa@chromium.org>
1 file changed