soc: qcom: smem: Avoid NULL pointer exception on remove

Don't set a pointer to NULL and then dereference it in the next
line.

Cc: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Andy Gross <agross@codeaurora.org>
diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
index 5236518..f402a60 100644
--- a/drivers/soc/qcom/smem.c
+++ b/drivers/soc/qcom/smem.c
@@ -730,8 +730,8 @@
 
 static int qcom_smem_remove(struct platform_device *pdev)
 {
-	__smem = NULL;
 	hwspin_lock_free(__smem->hwlock);
+	__smem = NULL;
 
 	return 0;
 }