drm/bridge/synopsys: dw-hdmi: Fix unwedge crash when no pinctrl entries

In commit 50f9495efe30 ("drm/bridge/synopsys: dw-hdmi: Add "unwedge"
for ddc bus") I stupidly used IS_ERR() to check for whether we have an
"unwedge" pinctrl state even though on most flows through the driver
the unwedge state will just be NULL.

Fix it so that we consistently use NULL for no unwedge state.

Fixes: 50f9495efe30 ("drm/bridge/synopsys: dw-hdmi: Add "unwedge" for ddc bus")
Cc: Douglas Anderson <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: Andrzej Hajda <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Neil Armstrong <[email protected]>
Cc: Jonas Karlman <[email protected]>
Cc: Jernej Skrabec <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Reported-by: Erico Nunes <[email protected]>
Signed-off-by: Douglas Anderson <[email protected]>
Signed-off-by: Sean Paul <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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