Fix crash in PlatformSensorReaderWin::SetReportingInterval

This is a follow-up to r537429 which fixes a crash introduced in
PlatformSensorReaderWin::SetReportingInterval because of a missing
return after logging the failure to instantiate an instance of
IPortableDeviceValues.

The log message is also tweaked to remove an extraneous space.

TBR=cco3@chromium.org

Bug: 756986
Change-Id: I5e07d365f93dc4d9df75d0ac743138ba3c7437ab
Reviewed-on: https://chromium-review.googlesource.com/924563Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537523}

services/device/generic_sensor/platform_sensor_provider_win.cc

@@ -43,7 +43,7 @@ class PlatformSensorProviderWin::SensorThread final : public base::Thread {
       static bool logged_failure = false;
       if (!logged_failure) {
         LOG(ERROR) << "Unable to create instance of SensorManager: "
-                   << _com_error(hr).ErrorMessage() << " (0x " << std::hex
+                   << _com_error(hr).ErrorMessage() << " (0x" << std::hex
                    << std::uppercase << std::setfill('0') << std::setw(8) << hr
                    << ")";
         logged_failure = true;

services/device/generic_sensor/platform_sensor_reader_win.cc

@@ -463,11 +463,12 @@ bool PlatformSensorReaderWin::SetReportingInterval(
     static bool logged_failure = false;
     if (!logged_failure) {
       LOG(ERROR) << "Unable to create instance of PortableDeviceValues: "
-                 << _com_error(hr).ErrorMessage() << " (0x " << std::hex
+                 << _com_error(hr).ErrorMessage() << " (0x" << std::hex
                  << std::uppercase << std::setfill('0') << std::setw(8) << hr
                  << ")";
       logged_failure = true;
     }
+    return false;
   }
 
   unsigned interval =