Re-indent clatd code with clang-format

clang-format --style file -i *.{c,h,cpp}

Bug: 118848635
Test: 1. browse over ipv6-only network
      2. atest clatd_test
      3. clang-format --style file -i *.{c,h,cpp}

Change-Id: I7389426101df7745370d0ac5c55176cd8fe2b08b
diff --git a/checksum.h b/checksum.h
index d0af88e..669b42c 100644
--- a/checksum.h
+++ b/checksum.h
@@ -18,9 +18,9 @@
 #ifndef __CHECKSUM_H__
 #define __CHECKSUM_H__
 
-#include <stdint.h>
 #include <netinet/ip.h>
 #include <netinet/ip6.h>
+#include <stdint.h>
 
 uint32_t ip_checksum_add(uint32_t current, const void *data, int len);
 uint16_t ip_checksum_finish(uint32_t temp_sum);