drm/nouveau: Remove unused variable ret

Fix the following coccicheck warnings:

./drivers/gpu/drm/nouveau/nouveau_bios.c:2048:5-8: Unneeded variable:
"ret". Return "0" on line 2061.
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
Link: https://gitlab.freedesktop.org/drm/nouveau/-/merge_requests/10

drivers/gpu/drm/nouveau/nouveau_bios.c

@@ -2045,7 +2045,6 @@ nouveau_run_vbios_init(struct drm_device *dev)
 {
 	struct nouveau_drm *drm = nouveau_drm(dev);
 	struct nvbios *bios = &drm->vbios;
-	int ret = 0;
 
 	/* Reset the BIOS head to 0. */
 	bios->state.crtchead = 0;
@@ -2058,7 +2057,7 @@ nouveau_run_vbios_init(struct drm_device *dev)
 		bios->fp.lvds_init_run = false;
 	}
 
-	return ret;
+	return 0;
 }
 
 static bool