- Add a protection in ReadGif against a possible negative or null   file size (found by coverity).
- Add a protection in ReadGif against a possible negative or null
  file size (found by coverity).


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@34980 27541ba8-7e3a-0410-8455-c3a389f83636

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