MDEV-24426 fixup: Assertion failure on shutdown

fil_crypt_find_space_to_rotate(): Always treat the sentinel value
that indicates that we have run out of work, even if at the same
time the thread should shut down due to other reasons.

Thanks to Matthias Leich for reproducing this bug with RQG.

storage/innobase/fil/fil0crypt.cc

@@ -1572,12 +1572,11 @@ static bool fil_crypt_find_space_to_rotate(
 		state->space = fil_space_t::next(state->space, *recheck,
 						 key_state->key_version != 0);
 		wake = state->should_shutdown();
-		if (wake) {
-			break;
-		}
 
 		if (state->space == fil_system.temp_space) {
 			goto done;
+		} else if (wake) {
+			break;
 		} else {
 			wake = true;
 		}