Stifle "Ignoring unknown switch" logging

Change-Id: I9770ab880f379e2f7f6a93d3c84990edec60a116
Signed-off-by: Mike Lockwood <lockwood@android.com>
diff --git a/VolumeManager.cpp b/VolumeManager.cpp
index 32b5679..906fb9e 100644
--- a/VolumeManager.cpp
+++ b/VolumeManager.cpp
@@ -184,8 +184,6 @@
         if (newAvailable != oldAvailable) {
             notifyUmsAvailable(newAvailable);
         }
-    } else {
-        SLOGW("Ignoring unknown switch '%s'", name);
     }
 }
 void VolumeManager::handleUsbCompositeEvent(NetlinkEvent *evt) {