Fix access to freed memory

Source should be freed after all jpeg operations completed
since it is used by these operations.

Change-Id: Ieb0741e1d219dc0513133a94d47df86b5f95cf29

src/images/SkImageDecoder_libjpeg.cpp

@@ -48,9 +48,9 @@ public:
     SkJPEGImageIndex() {}
     virtual ~SkJPEGImageIndex() {
         jpeg_destroy_huffman_index(index);
-        delete cinfo->src;
         jpeg_finish_decompress(cinfo);
         jpeg_destroy_decompress(cinfo);
+        delete cinfo->src;
         free(cinfo);
     }
     jpeg_decompress_struct *cinfo;