graphics/tiff: Fix CVE-2022-3970

Fix: TIFFReadRGBATileExt(): fix (unsigned) integer overflow on
strips/tiles > 2 GB

Obtained from: Upstream 227500897dfb07fb7d27f7aa570050e62617e3be

		(merged as a05860a0872d323e3fbf4390187ce934dd2b165e)

MFH: 2022Q4
Security: CVE-2022-3970
Security: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=53137