statsd: Remove repetitive logging if ODPM is not present

Bug: 133674207
Test: adb shell cmd stats pull-source 10038
Test: tested above command on Pixel device without ODPM
Change-Id: Iae8fe3c824167dad2659c1f8172f7646d7925d32

cmds/statsd/src/external/PowerStatsPuller.cpp

@@ -85,7 +85,6 @@ bool PowerStatsPuller::PullInternal(vector<shared_ptr<LogEvent>>* data) {
     std::lock_guard<std::mutex> lock(gPowerStatsHalMutex);
 
     if (!getPowerStatsHalLocked()) {
-        ALOGE("power.stats Hal not loaded");
         return false;
     }
 
@@ -116,6 +115,7 @@ bool PowerStatsPuller::PullInternal(vector<shared_ptr<LogEvent>>* data) {
         if (gRailInfo.empty()) {
             ALOGE("power.stats has no rail information");
             gPowerStatsExist = false; // No rail info, so never try again.
+            gPowerStatsHal = nullptr;
             return false;
         }
     }