drm/amd/display: Don't leak memory when updating streams

[Why]
The flip and full structures were allocated but never freed.

[How]
Free them at the end of the function. There's a small behavioral
change here with the function returning early if the allocation fails
but we wouldn't should be doing anything in that case anyway.

Fixes: c00e0cc0fdc0 ("drm/amd/display: Call into DC once per multiplane flip")
Fixes: ea39594e0855 ("drm/amd/display: Perform plane updates only when needed")
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Leo Li <sunpeng.li@amd.com>
Tested-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -4658,8 +4658,10 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
 	flip = kzalloc(sizeof(*flip), GFP_KERNEL);
 	full = kzalloc(sizeof(*full), GFP_KERNEL);
 
-	if (!flip || !full)
+	if (!flip || !full) {
 		dm_error("Failed to allocate update bundles\n");
+		goto cleanup;
+	}
 
 	/* update planes when needed */
 	for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
@@ -4883,6 +4885,10 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
 						     dc_state);
 		mutex_unlock(&dm->dc_lock);
 	}
+
+cleanup:
+	kfree(flip);
+	kfree(full);
 }
 
 /*