Fixing possible NullPointerException

Test: manul testing
Change-Id: I448c3d31c69a7c1649bfe30e864ad053cd8987bb
Bug: b/263304156

services/core/java/com/android/server/am/ForegroundServiceTypeLoggerModule.java

@@ -316,6 +316,10 @@ public class ForegroundServiceTypeLoggerModule {
         // then we should care, otherwise we assume
         // it's not related to any FGS
         UidState uidState = mUids.get(uid);
+        if (uidState == null) {
+            Log.w(TAG, "API event end called before start!");
+            return -1;
+        }
         if (uidState.mOpenWithFgsCount.contains(apiType)) {
             // are there any calls that started with an FGS?
             if (uidState.mOpenWithFgsCount.get(apiType) != 0) {