drm/ttm: Don't leak a resource on eviction error

On eviction errors other than -EMULTIHOP we were leaking a resource.
Fix.

v2:
- Avoid yet another goto (Andi Shyti)

Fixes: 40379792 ("drm/ttm: Fix multihop assert on eviction.")
Cc: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Christian Koenig <christian.koenig@amd.com>
Cc: Huang Rui <ray.huang@amd.com>
Cc: dri-devel@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v5.15+
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com> #v1
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230626091450.14757-4-thomas.hellstrom@linux.intel.com

drivers/gpu/drm/ttm/ttm_bo.c

@@ -458,18 +458,18 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo,
 		goto out;
 	}
 
-bounce:
+	do {
 		ret = ttm_bo_handle_move_mem(bo, evict_mem, true, ctx, &hop);
-	if (ret == -EMULTIHOP) {
+		if (ret != -EMULTIHOP)
+			break;
+
 		ret = ttm_bo_bounce_temp_buffer(bo, &evict_mem, ctx, &hop);
+	} while (!ret);
+
 	if (ret) {
+		ttm_resource_free(bo, &evict_mem);
 		if (ret != -ERESTARTSYS && ret != -EINTR)
 			pr_err("Buffer eviction failed\n");
-			ttm_resource_free(bo, &evict_mem);
-			goto out;
-		}
-		/* try and move to final place now. */
-		goto bounce;
 	}
 out:
 	return ret;