Check for nullptr when creating offline camera descriptor

Test: atest -cv CtsCameraTestCases
Bug: 257005030
Change-Id: If292ac3d78b1d0118952983ecc3cf60ae0d87a7d
diff --git a/services/camera/libcameraservice/CameraService.cpp b/services/camera/libcameraservice/CameraService.cpp
index 2569954..be76216 100644
--- a/services/camera/libcameraservice/CameraService.cpp
+++ b/services/camera/libcameraservice/CameraService.cpp
@@ -2094,6 +2094,10 @@
                 onlineClientDesc->getOwnerId(), onlinePriority.getState(),
                 // native clients don't have offline processing support.
                 /*ommScoreOffset*/ 0, /*systemNativeClient*/false);
+        if (offlineClientDesc == nullptr) {
+            ALOGE("%s: Offline client descriptor was NULL", __FUNCTION__);
+            return BAD_VALUE;
+        }
 
         // Allow only one offline device per camera
         auto incompatibleClients = mActiveClientManager.getIncompatibleClients(offlineClientDesc);