Move system/core/ off NO_ERROR.

It causes trouble for Windows, and OK already exists.

Bug: N/A
Test: builds
Change-Id: Ida22fd658b0ebb259c710ba39049b07c9e495d9c
diff --git a/healthd/BatteryMonitor.cpp b/healthd/BatteryMonitor.cpp
index 80c5afe..2a5667c 100644
--- a/healthd/BatteryMonitor.cpp
+++ b/healthd/BatteryMonitor.cpp
@@ -357,7 +357,7 @@
         if (!mHealthdConfig->batteryChargeCounterPath.isEmpty()) {
             val->valueInt64 =
                 getIntField(mHealthdConfig->batteryChargeCounterPath);
-            ret = NO_ERROR;
+            ret = OK;
         } else {
             ret = NAME_NOT_FOUND;
         }
@@ -367,7 +367,7 @@
         if (!mHealthdConfig->batteryCurrentNowPath.isEmpty()) {
             val->valueInt64 =
                 getIntField(mHealthdConfig->batteryCurrentNowPath);
-            ret = NO_ERROR;
+            ret = OK;
         } else {
             ret = NAME_NOT_FOUND;
         }
@@ -377,7 +377,7 @@
         if (!mHealthdConfig->batteryCurrentAvgPath.isEmpty()) {
             val->valueInt64 =
                 getIntField(mHealthdConfig->batteryCurrentAvgPath);
-            ret = NO_ERROR;
+            ret = OK;
         } else {
             ret = NAME_NOT_FOUND;
         }
@@ -387,7 +387,7 @@
         if (!mHealthdConfig->batteryCapacityPath.isEmpty()) {
             val->valueInt64 =
                 getIntField(mHealthdConfig->batteryCapacityPath);
-            ret = NO_ERROR;
+            ret = OK;
         } else {
             ret = NAME_NOT_FOUND;
         }
@@ -403,7 +403,7 @@
 
     case BATTERY_PROP_BATTERY_STATUS:
         val->valueInt64 = getChargeStatus();
-        ret = NO_ERROR;
+        ret = OK;
         break;
 
     default: