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Fixes a cppcheck warning. Possibly we should just convert the array type to `long` since that's what oggpack_look() returns, using negative values to report error. However, none of the compared values are out of range for either type so it doesn't really matter. Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com> Signed-off-by: Ralph Giles <giles@thaumas.net>