drm/nouveau/TBDdevinit: don't fail when PMU/PRE_OS is missing from VBIOS

BugLink: https://bugs.launchpad.net/bugs/1798770

[ Upstream commit 0a6986c6 ]

This Falcon application doesn't appear to be present on some newer
systems, so let's not fail init if we can't find it.

TBD: is there a way to determine whether it *should* be there?
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

drivers/gpu/drm/nouveau/nvkm/subdev/devinit/gm204.c

@@ -161,7 +161,8 @@ gm204_devinit_post(struct nvkm_devinit *base, bool post)
 	}
 
 	/* load and execute some other ucode image (bios therm?) */
-	return pmu_load(init, 0x01, post, NULL, NULL);
+	pmu_load(init, 0x01, post, NULL, NULL);
+	return 0;
 }
 
 static const struct nvkm_devinit_func