drm/msm/gem: Drop early returns in close/purge vma

Keep the warn, but drop the early return. If we do manage to hit this
sort of issue, skipping the cleanup just makes things worse (dangling
drm_mm_nodes when the msm_gem_vma is freed, etc). Whereas the worst
that happens if we tear down a mapping the GPU is accessing is that we
get GPU iova faults, but otherwise the world keeps spinning.

Signed-off-by: Rob Clark <[e-mail]>
Tested-by: Steev Klimaszewski <[e-mail]>
Reported-by: Steev Klimaszewski <[e-mail]>
Patchwork: https://patchwork.freedesktop.org/patch/489115/
Link: https://lore.kernel.org/r/[e-mail]

drivers/gpu/drm/msm/msm_gem_vma.c

···
 	unsigned size = vma->node.size;
 
 	/* Print a message if we try to purge a vma in use */
-	if (GEM_WARN_ON(msm_gem_vma_inuse(vma)))
-		return;
+	GEM_WARN_ON(msm_gem_vma_inuse(vma));
 
 	/* Don't do anything if the memory isn't mapped */
 	if (!vma->mapped)
···
 void msm_gem_close_vma(struct msm_gem_address_space *aspace,
 		struct msm_gem_vma *vma)
 {
-	if (GEM_WARN_ON(msm_gem_vma_inuse(vma) || vma->mapped))
-		return;
+	GEM_WARN_ON(msm_gem_vma_inuse(vma) || vma->mapped);
 
 	spin_lock(&aspace->lock);
 	if (vma->iova)