Check for min int in BMP header

Bug: os-fuzz:6288

Negating it is undefined, so don't try.

Change-Id: I055520b8036dd8b355e744114717e08d76206bc1
Reviewed-on: https://skia-review.googlesource.com/107062
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Leon Scroggins <scroggo@google.com>
1 file changed