drm/nouveau/kms: Search for encoders' connectors properly
While the way we find the associated connector for an encoder is just fine for legacy modesetting, it's not correct for nv50+ since that uses atomic modesetting. For reference, see the drm_encoder kdocs. Fix this by removing nouveau_encoder_connector_get(), and replacing it with nv04_encoder_get_connector(), nv50_outp_get_old_connector(), and nv50_outp_get_new_connector(). v2: * Don't line-wrap for_each_(old|new)_connector_in_state in nv50_outp_get_(old|new)_connector() - sravn v3: * Fix potential uninitialized usage of nv_connector (needs to be initialized to NULL at the start). Thanks kernel test robot! v4: * Actually fix uninitialized nv_connector usage in nv50_audio_component_get_eld(). The previous fix wouldn't have worked since we would have started out with nv_connector == NULL, but wouldn't clear it after a single drm_for_each_encoder() iteration. Thanks again Kernel bot! Signed-off-by: NLyude Paul <lyude@redhat.com> Reviewed-by: NBen Skeggs <bskeggs@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200826182456.322681-7-lyude@redhat.com
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