valgrind uninitialized warning in delta generator

[alexlarsson]

If i run:
valgrind --track-origins=yes ostree static-delta generate --repo=repo --empty master

Then I get:

==8968== Conditional jump or move depends on uninitialised value(s)
==8968==    at 0x52F681D: ??? (in /usr/lib64/liblzma.so.5.2.2)
==8968==    by 0x52F6F22: ??? (in /usr/lib64/liblzma.so.5.2.2)
==8968==    by 0x52ECC03: ??? (in /usr/lib64/liblzma.so.5.2.2)
==8968==    by 0x52F05C5: ??? (in /usr/lib64/liblzma.so.5.2.2)
==8968==    by 0x52F06F5: ??? (in /usr/lib64/liblzma.so.5.2.2)
==8968==    by 0x52F07D2: lzma_stream_encoder (in /usr/lib64/liblzma.so.5.2.2)
==8968==    by 0x52EF24D: lzma_easy_encoder (in /usr/lib64/liblzma.so.5.2.2)
==8968==    by 0x4E5181D: _ostree_lzma_compressor_convert (ostree-lzma-compressor.c:185)
==8968==    by 0x5825EE9: write_internal (gconverteroutputstream.c:450)
==8968==    by 0x585851B: g_output_stream_real_splice (goutputstream.c:581)
==8968==    by 0x585A9BB: g_output_stream_splice (goutputstream.c:533)
==8968==    by 0x4E855C6: ostree_repo_static_delta_generate (ostree-repo-static-delta-compilation.c:1436)
==8968==  Uninitialised value was created by a heap allocation
==8968==    at 0x4C2BBAD: malloc (vg_replace_malloc.c:299)
==8968==    by 0x52F6FD9: ??? (in /usr/lib64/liblzma.so.5.2.2)
==8968==    by 0x52ECC03: ??? (in /usr/lib64/liblzma.so.5.2.2)
==8968==    by 0x52F05C5: ??? (in /usr/lib64/liblzma.so.5.2.2)
==8968==    by 0x52F06F5: ??? (in /usr/lib64/liblzma.so.5.2.2)
==8968==    by 0x52F07D2: lzma_stream_encoder (in /usr/lib64/liblzma.so.5.2.2)
==8968==    by 0x52EF24D: lzma_easy_encoder (in /usr/lib64/liblzma.so.5.2.2)
==8968==    by 0x4E5181D: _ostree_lzma_compressor_convert (ostree-lzma-compressor.c:185)
==8968==    by 0x5825EE9: write_internal (gconverteroutputstream.c:450)
==8968==    by 0x585851B: g_output_stream_real_splice (goutputstream.c:581)
==8968==    by 0x585A9BB: g_output_stream_splice (goutputstream.c:533)
==8968==    by 0x4E855C6: ostree_repo_static_delta_generate (ostree-repo-static-delta-compilation.c:1436)

This seems repeatable and happens for all repos/branches i tried. Clearly it still works, but it would be nice to have the build valgrind warning free, and the deltas repeatable.