#3796 fix the memory leak found with valgrind + icc debug build refs[t:3796]

git-svn-id: file:///svn/toku/tokudb@33292 c7de825b-a66e-492c-adef-691d508d4ae1

newbrt/sub_block.c

@@ -248,6 +248,7 @@ compress_all_sub_blocks(int n_sub_blocks, struct sub_block sub_block[], char *un
 
         // wait for all of the work to complete
         workset_join(&ws);
+        workset_destroy(&ws);
 
         // squeeze out the holes not used by the compress bound
         compressed_ptr = compressed_base_ptr + sub_block[0].compressed_size;