Fixed a few warnings. Rev: src/modules/Gmp/mpz_glue.c:1.94 Rev: src/modules/Gz/zlibmod.c:1.40 Rev: src/modules/Image/encodings/_xpm.c:1.17 Rev: src/modules/Image/encodings/ilbm.c:1.22 Rev: src/modules/Image/encodings/pcx.c:1.16 Rev: src/modules/Image/encodings/png.c:1.42 Rev: src/modules/Image/encodings/psd.c:1.30 Rev: src/modules/Image/encodings/pvr.c:1.14 Rev: src/modules/Image/encodings/ras.c:1.14 Rev: src/modules/Image/encodings/tga.c:1.27 Rev: src/modules/Image/encodings/tim.c:1.12 Rev: src/modules/Image/encodings/xcf.c:1.38 Rev: src/modules/Image/image.c:1.188