TJBench: Fix errors when decomp. files w/ ICC data Embedded ICC profiles can cause the size of a JPEG file to exceed the size returned by tjBufSize() (which is really meant to be used for compression anyhow, not for decompression), and this was causing a segfault (C) or an ArrayIndexOutOfBoundsException (Java) when decompressing such files with TJBench. This commit modifies the benchmark such that, when tiled decompression is disabled, it re-uses the source buffer as the primary JPEG buffer.