Fix memory leaks.

[dgoel]

Here's the valgrind output before the fix:

$ valgrind ./easylzma_test 
==17669== Memcheck, a memory error detector
==17669== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==17669== Using Valgrind-3.12.0 and LibVEX; rerun with -h for copyright info
==17669== Command: ./easylzma_test
==17669== 
round trip lzma test:    ok
round trip lzip test:    ok
correct lzip test:    ok
lzip as lzma test:    ok
correct lzma test:    ok
lzma as lzip test:    ok
corrupt crc test:    ok
bad lzip size test:    ok
bad lzma size test:    ok
bad lzma size 2 test:    ok

10/10 tests passed
==17669== 
==17669== HEAP SUMMARY:
==17669==     in use at exit: 27,790,268 bytes in 20 blocks
==17669==   total heap usage: 69 allocs, 49 frees, 79,406,342 bytes allocated
==17669== 
==17669== LEAK SUMMARY:
==17669==    definitely lost: 1,319,688 bytes in 8 blocks
==17669==    indirectly lost: 15,718,572 bytes in 11 blocks
==17669==      possibly lost: 10,752,008 bytes in 1 blocks
==17669==    still reachable: 0 bytes in 0 blocks
==17669==         suppressed: 0 bytes in 0 blocks
==17669== Rerun with --leak-check=full to see details of leaked memory
==17669== 
==17669== For counts of detected and suppressed errors, rerun with: -v
==17669== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)

And here's the valgrind output after the fix:

$ valgrind ./easylzma_test
==19819== Memcheck, a memory error detector
==19819== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==19819== Using Valgrind-3.12.0 and LibVEX; rerun with -h for copyright info
==19819== Command: ./test/easylzma_test
==19819== 
round trip lzma test:    ok
round trip lzip test:    ok
correct lzip test:    ok
lzip as lzma test:    ok
correct lzma test:    ok
lzma as lzip test:    ok
corrupt crc test:    ok
bad lzip size test:    ok
bad lzma size test:    ok
bad lzma size 2 test:    ok

10/10 tests passed
==19819== 
==19819== HEAP SUMMARY:
==19819==     in use at exit: 0 bytes in 0 blocks
==19819==   total heap usage: 69 allocs, 69 frees, 79,406,342 bytes allocated
==19819== 
==19819== All heap blocks were freed -- no leaks are possible
==19819== 
==19819== For counts of detected and suppressed errors, rerun with: -v
==19819== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)

[dgoel]

Closing because author is not responsive.