drm/crtc: fix uninitialized variable use even harder

DRM_MODESET_LOCK_ALL_BEGIN() has a hidden trap-door (aka retry loop),
which means we can't rely too much on variable initializers.

Fixes: 6e455f5 ("drm/crtc: fix uninitialized variable use")
Signed-off-by: Rob Clark <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
Reviewed-by: Abhinav Kumar <[email protected]>
Reviewed-by: Dmitry Baryshkov <[email protected]>
Tested-by: Dmitry Baryshkov <[email protected]> # sc7180, sdm845
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Dmitry Baryshkov <[email protected]>

Author: robclark

drivers/gpu/drm/drm_crtc.c

@@ -904,6 +904,7 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
 	connector_set = NULL;
 	fb = NULL;
 	mode = NULL;
+	num_connectors = 0;
 
 	DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);