drm/i915/skl: Use a more idomatic early return

We can coalesce the WARN() condition with the WARN() itself and, as we
are returning early, we can de-intent the rest of the function.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_ddi.c

@@ -1193,11 +1193,10 @@ skl_ddi_calculate_wrpll(int clock /* in Hz */,
 		}
 	}
 
-	if (min_dco_index > 2) {
-		WARN(1, "No valid parameters found for pixel clock: %dHz\n",
-		     clock);
+	if (WARN(min_dco_index > 2,
+		 "No valid parameters found for pixel clock: %dHz\n", clock))
 		return false;
-	} else {
+
 	wrpll_params->central_freq = dco_central_freq[min_dco_index];
 
 	switch (dco_central_freq[min_dco_index]) {
@@ -1262,8 +1261,6 @@ skl_ddi_calculate_wrpll(int clock /* in Hz */,
 		div_u64(((div_u64(dco_freq, 24) -
 			  wrpll_params->dco_integer * MHz(1)) * 0x8000), MHz(1));
 
-	}
-
 	return true;
 }