Minor bug in git-apply's patch-cleaning

If you apply in reverse a patch which adds junk (e.g., terminal whitespace), it complains about the junk you're adding, even though (since it's in reverse) you're actually removing that junk.

It's arguable as to whether it should complain about junk in - lines with --reverse; it's likely that you care more about getting the patch unapplied exactly than not reintroducing removed whitespace. But complaining about junk in + lines is actually confusing.

	-Daniel
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