vold: cleanups for O_CLOEXEC tidy checks.

Bug: 129350825
Test: compiles and boots
Change-Id: I83a484ca15df1b757b670008f15af5504bc94df1
diff --git a/VolumeManager.cpp b/VolumeManager.cpp
index 51eec8a..897c2a8 100644
--- a/VolumeManager.cpp
+++ b/VolumeManager.cpp
@@ -500,7 +500,8 @@
         }
 
         // We purposefully leave the namespace open across the fork
-        nsFd = openat(pidFd, "ns/mnt", O_RDONLY);  // not O_CLOEXEC
+        // NOLINTNEXTLINE(android-cloexec-open): Deliberately not O_CLOEXEC
+        nsFd = openat(pidFd, "ns/mnt", O_RDONLY);
         if (nsFd < 0) {
             PLOG(WARNING) << "Failed to open namespace for " << de->d_name;
             goto next;