Do not trigger revoke-perm callbacks if no change

Revoking a permission might e.g. kill the the app. If a permission gets
revoked that was never granted there was no change, hence no need to call
the callbacks and also no need to kill the app.

Test: "pm clear" two times in a row. The second one did trigger a kill
before, not anymore.
Bug: 133830856
Change-Id: I357f2d939520ac78ef82ecf4feb7936455950fc4

services/core/java/com/android/server/pm/permission/PermissionManagerService.java

@@ -2269,6 +2269,11 @@ public class PermissionManagerService {
             return;
         }
 
+        // Permission is already revoked, no need to do anything.
+        if (!permissionsState.hasRuntimePermission(permName, userId)) {
+            return;
+        }
+
         if (permissionsState.revokeRuntimePermission(bp, userId) ==
                 PERMISSION_OPERATION_FAILURE) {
             return;