Wrap fd with unique_fd so it won't leak.

Bug: 74021345
Test: manual and atest incidentd_test
Change-Id: Ib1000bfe6917c3d5cae7b9edce5b67d50897e10d
diff --git a/cmds/incidentd/src/incidentd_util.h b/cmds/incidentd/src/incidentd_util.h
index 3f7df91..228d776 100644
--- a/cmds/incidentd/src/incidentd_util.h
+++ b/cmds/incidentd/src/incidentd_util.h
@@ -41,8 +41,8 @@
 
     bool init();
     bool close();
-    int readFd() const;
-    int writeFd() const;
+    unique_fd& readFd();
+    unique_fd& writeFd();
 
 private:
     unique_fd mRead;