CachedBluetoothDevice: Simplify ProfleConnectionState check

Check whether ProfileConnectionState is empty instead of checking
whether it is null.

BUG: N/A

Change-Id: I553e7b8b0c1b3ae967dcc0ecd482b7ff19f3c1f6
Signed-off-by: xutianguo <xutianguo@xiaomi.com>
diff --git a/packages/SettingsLib/src/com/android/settingslib/bluetooth/CachedBluetoothDevice.java b/packages/SettingsLib/src/com/android/settingslib/bluetooth/CachedBluetoothDevice.java
index e279a09..5f302c6 100644
--- a/packages/SettingsLib/src/com/android/settingslib/bluetooth/CachedBluetoothDevice.java
+++ b/packages/SettingsLib/src/com/android/settingslib/bluetooth/CachedBluetoothDevice.java
@@ -332,8 +332,7 @@
     }
 
     public int getProfileConnectionState(LocalBluetoothProfile profile) {
-        if (mProfileConnectionState == null ||
-                mProfileConnectionState.get(profile) == null) {
+        if (mProfileConnectionState.get(profile) == null) {
             // If cache is empty make the binder call to get the state
             int state = profile.getConnectionStatus(mDevice);
             mProfileConnectionState.put(profile, state);