Merge "msm: ipa3: Fix null pointer dereference error"

drivers/platform/msm/ipa/ipa_v3/ipa_nat.c

@@ -150,7 +150,7 @@ static int ipa3_nat_ipv6ct_mmap(
 	/*
 	 * Check if no smmu or non dma coherent
 	 */
-	if (cb && (!cb->valid || !dev_is_dma_coherent(cb->dev))) {
+	if (cb && cb->dev && (!cb->valid || !dev_is_dma_coherent(cb->dev))) {
 
 		IPADBG("Either smmu valid=%u and/or DMA coherent=%u false\n",
 			   cb->valid, !dev_is_dma_coherent(cb->dev));