Allow non-existing fstab.postinstall am: 4b28a53926

Change-Id: I2a40679b63b16cb64a5b7a76410192fa95370b9d
diff --git a/dynamic_partition_control_android.cc b/dynamic_partition_control_android.cc
index a310f20..48ad5f0 100644
--- a/dynamic_partition_control_android.cc
+++ b/dynamic_partition_control_android.cc
@@ -547,7 +547,10 @@
     const std::string& path) {
   Fstab fstab;
   if (!ReadFstabFromFile(path, &fstab)) {
-    LOG(WARNING) << "Cannot read fstab from " << path;
+    PLOG(WARNING) << "Cannot read fstab from " << path;
+    if (errno == ENOENT) {
+      return false;
+    }
     return std::nullopt;
   }
   for (const auto& entry : fstab) {