driver: gpu: drm: i915: remove cast for kzalloc return value

remove cast for kzalloc return value.
Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/gpu/drm/i915/intel_sdvo.c

@@ -451,7 +451,7 @@ static bool intel_sdvo_write_cmd(struct intel_sdvo *intel_sdvo, u8 cmd,
 	int i, ret = true;
 
         /* Would be simpler to allocate both in one go ? */        
-	buf = (u8 *)kzalloc(args_len * 2 + 2, GFP_KERNEL);
+	buf = kzalloc(args_len * 2 + 2, GFP_KERNEL);
 	if (!buf)
 		return false;