branches/zip: buf_block_set_state(): Allow the state transition from

BUF_BLOCK_READY_FOR_USE to BUF_BLOCK_NOT_USED.

include/buf0buf.ic

@@ -127,14 +127,15 @@ buf_block_set_state(
 		break;
 	case BUF_BLOCK_READY_FOR_USE:
 		ut_a(state == BUF_BLOCK_MEMORY
-		      || state == BUF_BLOCK_FILE_PAGE);
+		     || state == BUF_BLOCK_FILE_PAGE
+		     || state == BUF_BLOCK_NOT_USED);
 		break;
 	case BUF_BLOCK_MEMORY:
 		ut_a(state == BUF_BLOCK_NOT_USED);
 		break;
 	case BUF_BLOCK_FILE_PAGE:
 		ut_a(state == BUF_BLOCK_NOT_USED
-		      || state == BUF_BLOCK_REMOVE_HASH);
+		     || state == BUF_BLOCK_REMOVE_HASH);
 		break;
 	case BUF_BLOCK_REMOVE_HASH:
 		ut_a(state == BUF_BLOCK_MEMORY);