Check for ignored StatusOr results

Test: m
Change-Id: I2b4c31b53b81417ddb7dc8d9b56da3f77ca033c8
diff --git a/server/BandwidthController.cpp b/server/BandwidthController.cpp
index a2e63c0..3ee3ac1 100644
--- a/server/BandwidthController.cpp
+++ b/server/BandwidthController.cpp
@@ -621,7 +621,8 @@
         ALOGE("Updating quota %s failed (%s)", quotaName.c_str(), toString(file).c_str());
         return -res;
     }
-    sys.fprintf(file.value().get(), "%" PRId64 "\n", bytes);
+    // TODO: should we propagate this error?
+    sys.fprintf(file.value().get(), "%" PRId64 "\n", bytes).ignoreError();
     return 0;
 }