Fix -Wformat error in TiffDecode

[lukegb]

When building under an environment with -Werror=format, TiffDecode.c no longer builds:

src/libImaging/TiffDecode.c: In function ‘_tiffReadProc’:
src/libImaging/TiffDecode.c:59:58: error: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘toff_t’ {aka ‘long unsigned int’} [-Werror=format=]
src/libImaging/TiffDecode.c:59:67: error: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘toff_t’ {aka ‘long unsigned int’} [-Werror=format=]

[radarhere]

Building normally, I find that there is currently a

warning: format specifies type 'unsigned long' but the argument has type 'toff_t' (aka 'unsigned long long') [-Wformat]

With your change, it becomes

warning: format specifies type 'int' but the argument has type 'toff_t' (aka 'unsigned long long') [-Wformat]

[lukegb]

Hmm, interesting.

I suspect there's a disparity in what underlying type these are being mapped to on your system vs mine - IIRC there are special format specifiers or macros for this case, but failing that it might make sense to explicitly cast to a different type like is being done above.

[lukegb]

I tried to reply by email but GitHub apparently dropped it. Oh well.