[thin_show_dups] remove variable number of mems per chunks.

Too slow and not used.

thin-provisioning/chunk_stream.cc

@@ -5,19 +5,5 @@ using namespace thin_provisioning;
 
 //----------------------------------------------------------------
 
-uint8_t
-chunk::operator[](uint64_t n) const
-{
-	std::deque<mem>::const_iterator it;
-	for (it = mem_.begin(); it != mem_.end(); it++) {
-		uint64_t mem_len = it->end - it->begin;
-		if (n > mem_len)
-			n -= mem_len;
-		else
-			return it->begin[n];
-	}
-
-	throw runtime_error("chunk out of bounds");
-}
 
 //----------------------------------------------------------------