Revert "ion: Fix typo when checking dmabuf"

This reverts commit 764a80ff6e5a2273c48f650672599f304e2c5294.

Change-Id: I60bfb960880d03ee8d031afed77a117258dfedc0
diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index 40eaf59..febac76 100755
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -1403,7 +1403,7 @@
 		return ERR_CAST(dmabuf);
 	/* if this memory came from ion */
 
-	if (!dmabuf->ops != &dma_buf_ops) {
+	if (dmabuf->ops != &dma_buf_ops) {
 		pr_err("%s: can not import dmabuf from another exporter\n",
 		       __func__);
 		dma_buf_put(dmabuf);