drm/i915/display: use clk_off name to avoid double negation

Instead of "ungated" use the same name for the variable as the bitfield,
making it clearer what's the intent of the checks.
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Clinton Taylor <Clinton.A.Taylor@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191217230529.25092-2-lucas.demarchi@intel.com

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

@@ -3008,12 +3008,10 @@ static void icl_sanitize_port_clk_off(struct drm_i915_private *dev_priv,
 	val = I915_READ(ICL_DPCLKA_CFGCR0);
 	for_each_port_masked(port, port_mask) {
 		enum phy phy = intel_port_to_phy(dev_priv, port);
+		bool ddi_clk_off = val & icl_dpclka_cfgcr0_clk_off(dev_priv,
+								   phy);
 
-		bool ddi_clk_ungated = !(val &
-					 icl_dpclka_cfgcr0_clk_off(dev_priv,
-								   phy));
-
-		if (ddi_clk_needed == ddi_clk_ungated)
+		if (ddi_clk_needed == !ddi_clk_off)
 			continue;
 
 		/*