Enable some tests which should work now.
* test-loaders.c (main): Enable some tests which should work now. * io-wbmp.c (gdk_pixbuf__wbmp_image_load_increment): Detect invalid image dimensions and insufficient memory. * io-tga.c (try_preload): Detect invalid image dimensions. (gdk_pixbuf__tga_stop_load): Don't try to unref NULL pointers. * io-ico.c (DecodeHeader): Detect some invalid headers and don't segfault.
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