bug#9045: 24.0.50; Cannot display image: (Invalid image type `jpeg')

[Glenn Morris]

Chong Yidong wrote:

>> This happens because in the function `image-type',
>> image-type-from-file-header returns `jpeg', and image-types has no entry
>> for jpeg.
>
> Fixed in trunk.

Problem reintroduced by 2012-06-11 change to imagemagick-register-types.

Perhaps image-type-from-file-name should stop at the first _supported_
image type it finds?