gpu: host1x: Plug potential memory leak

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2154295
Upstream Status: v5.15-rc4

commit c3dbfb9
Author:     Thierry Reding <treding@nvidia.com>
AuthorDate: Thu Sep  2 22:33:09 2021 +0200
Commit:     Thierry Reding <treding@nvidia.com>
CommitDate: Thu Sep 16 18:06:52 2021 +0200

    The memory allocated for a DMA fence could be leaked if the code failed
    to allocate the waiter object. Make sure to release the fence allocation
    on failure.

    Reported-by: kernel test robot <lkp@intel.com>
    Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
    Signed-off-by: Thierry Reding <treding@nvidia.com>

Signed-off-by: Mika Penttilä <mpenttil@redhat.com>

Author: Mika Penttilä

drivers/gpu/host1x/fence.c

@@ -152,8 +152,10 @@ struct dma_fence *host1x_fence_create(struct host1x_syncpt *sp, u32 threshold)
 		return ERR_PTR(-ENOMEM);
 
 	fence->waiter = kzalloc(sizeof(*fence->waiter), GFP_KERNEL);
-	if (!fence->waiter)
+	if (!fence->waiter) {
+		kfree(fence);
 		return ERR_PTR(-ENOMEM);
+	}
 
 	fence->sp = sp;
 	fence->threshold = threshold;