Huffman GPU decoder: allow single segment decode

The restriction seems to be just artificial - the GPU decoder is able
to decode single stream without problems.

refers to GH-96

Author: MartinPulec

src/gpujpeg_huffman_gpu_decoder.cu

@@ -666,7 +666,7 @@ gpujpeg_huffman_gpu_decoder_decode(struct gpujpeg_decoder* decoder)
     // Get coder
     struct gpujpeg_coder* coder = &decoder->coder;
 
-    assert(coder->param.restart_interval > 0);
+    // assert(coder->param.restart_interval > 0);
 
     int comp_count = 1;
     if (coder->param.interleaved == 1) {