image/jpeg: when following component selectors, only consider valid
components. This fixes decoding JPEG images where the component selector is 0. Such images are rare, but not impossible. Change-Id: I6d221bce01cce8cc0440e117543233371782ca22 Reviewed-on: https://go-review.googlesource.com/6421Reviewed-by: Rob Pike <r@golang.org>
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