Remove unnecessary optimization for Int32.Min/MaxValue for WriteOffset - those would be out of range anyway.
Remove unnecessary optimization for Int32.Min/MaxValue for WriteOffset - those
would be out of range anyway.

zaccharles/nodatime,malcolmr/nodatime,BenJenkinson/nodatime,nodatime/nodatime,BenJenkinson/nodatime,nodatime/nodatime,jskeet/nodatime,zaccharles/nodatime,malcolmr/nodatime,zaccharles/nodatime,zaccharles/nodatime,zaccharles/nodatime,zaccharles/nodatime,malcolmr/nodatime,jskeet/nodatime,malcolmr/nodatime