drm/i915: intel_display.c handle latency variable efficiently

By handling latency variable efficiently we also get rid of this warning :

  CC [M]  drivers/gpu/drm/i915/intel_display.o
drivers/gpu/drm/i915/intel_display.c: In function ‘igd_enable_cxsr’:
drivers/gpu/drm/i915/intel_display.c:1918: warning: ‘latency’ may be used uninitialized in this function

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

drivers/gpu/drm/i915/intel_display.c

@@ -2185,15 +2185,14 @@ static struct cxsr_latency *intel_get_cxsr_latency(int is_desktop, int fsb,
 		latency = &cxsr_latency_table[i];
 		if (is_desktop == latency->is_desktop &&
 		    fsb == latency->fsb_freq && mem == latency->mem_freq)
-			break;
-	}
-	if (i >= ARRAY_SIZE(cxsr_latency_table)) {
-		DRM_DEBUG("Unknown FSB/MEM found, disable CxSR\n");
-		return NULL;
-	}
 			return latency;
 	}
 
+	DRM_DEBUG("Unknown FSB/MEM found, disable CxSR\n");
+
+	return NULL;
+}
+
 static void igd_disable_cxsr(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;