width / height are unsigned; fixes a warning with msvs /analyze:
C6340: Mismatch on sign: 'const unsigned int' passed as _Param_(4) when
some signed type is required in call to 'fprintf'.
(cherry picked from commit 47d26be760d043fc2dde91b26e424b955054c0ef)
Change-Id: I5f1fad4c93745baf17d70178a5e66579ccd2b155