msm: kgsl: Fix memleak in IOMMU clock disable

IOMMU clock disable on timestamp allocates memory and passes
the pointer to event created, this memory should be freed
when the event fires.

Change-Id: Ia714550ce8a05958fb6668293cd0400a0f69d4af
Signed-off-by: Tarun Karra <tkarra@codeaurora.org>
diff --git a/drivers/gpu/msm/kgsl_iommu.c b/drivers/gpu/msm/kgsl_iommu.c
index 2af8d27..e87c670 100755
--- a/drivers/gpu/msm/kgsl_iommu.c
+++ b/drivers/gpu/msm/kgsl_iommu.c
@@ -514,6 +514,9 @@
 	else
 		/* something went wrong with the event handling mechanism */
 		BUG_ON(1);
+
+	/* Free param we are done using it */
+	kfree(param);
 }
 
 /*