drm/i915: Always initialize dpll.lock

Initialize the dll.lock mutex whether or not we manage to
initialize the rest of the dpll mgr.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220921122343.13061-2-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/display/intel_dpll_mgr.c

@@ -4193,6 +4193,8 @@ void intel_shared_dpll_init(struct drm_i915_private *dev_priv)
 	const struct dpll_info *dpll_info;
 	int i;
 
+	mutex_init(&dev_priv->display.dpll.lock);
+
 	if (IS_DG2(dev_priv))
 		/* No shared DPLLs on DG2; port PLLs are part of the PHY */
 		dpll_mgr = NULL;
@@ -4237,7 +4239,6 @@ void intel_shared_dpll_init(struct drm_i915_private *dev_priv)
 
 	dev_priv->display.dpll.mgr = dpll_mgr;
 	dev_priv->display.dpll.num_shared_dpll = i;
-	mutex_init(&dev_priv->display.dpll.lock);
 }
 
 /**